Welcome to 100 London Law Firm

Secure Your UK Future With Bespoke Legal Solutions

Innovative Mayfair solicitors for investors, entrepreneurs, businesses and professionals — delivering personalised UK visa, permanent residency and British citizenship strategies with near-100% success.

ABOUT 100 LONDON LAW FIRM

Bespoke solutions forinvestors & professionals

100 London Law Firm Ltd is an innovative London law firm offering personalised UK residency and citizenship solutions for HNWIs, investors, entrepreneurs, celebrities, professionals and businesses.

Or call us on 0789 4355 449

100 London Law Firm advisers reviewing documents together in a modern office

OUR SERVICES

Bespoke legal services for investors & businesses

From investor and entrepreneur routes to business, employment and employer sponsorship — our Mayfair solicitors provide clear, personalised advice at every stage.

Indefinite Leave to Remain

Our team is experienced at helping migrants secure Indefinite Leave to Remain (ILR) in the UK and can support you in the application process to ensure a successful result. Individuals who have held the same type of British visa for 5 years or more are eligible to apply for ILR, although in certain circumstances you may be eligible after just 3 years. Indefinite Leave to Remain enables migrants from outside of the UK to stay in the UK without restrictions and is the first step to take before applying for full British citizenship or naturalisation. Almost all other British visa routes are eligible to apply for ILR after meeting certain other requirements, including those who have been on Tier 1 Visas, Tier 2 Work Visas, and Spouse Visas. The conditions that you need to meet to qualify for ILR are as follows: You have held the same type of British visa for 5 years or more Proof that you meet the B1 levels of English You must pass the Life in the UK test No criminal record and you cannot have breached the immigration laws during your stay in the UK You cannot have spent more than 180 days outside of the UK within any year of living in the UK The requirements can vary so it’s best to speak to an Immigration Lawyer to determine if you’re eligible to apply and what you will need to include with your ILR application.

British Citizenship Naturalisation

You can apply to become a British citizen through naturalisation if you meet the relevant criteria which have been set out in the British Nationality Act 1981. This is the most common approach to become a British citizen. This application is decided and granted by the Secretary of State for the Home Office. The main requirements for naturalisation involve meeting the residence requirement, settled status requirement, good character requirements and the English language test and Life in the UK test requirements. Naturalisation after holding settlement for 12 months: You are eligible to apply to naturalise as a British citizen under Section 6(1) of the British Nationality Act 1981, provided you meet the following requirements: You are aged 18 or over You are of good character i.e., do not have a serious or recent criminal record, or any adverse immigration history You are of sound mind You intend to make the UK your permanent home You have passed a Life in the UK test You have met the knowledge of English language test requirements You have met the residence requirements In addition, the following residence requirement must usually apply: You have lived in the UK for at least 5 years prior to your application You have not spent more than 450 days outside the UK in those 5 years You have not spent more than 90 days outside the UK in the last 12 months You had Settlement (also known as indefinite leave to remain/ILR) for the last 12 months; if you are not an EEA citizen You had Settled Status under the EU Settlement Scheme (also known as indefinite leave to remain) for the last 12 months; if you are an EEA citizen or eligible to apply to the scheme. Naturalisation as the spouse of a British citizen A person who is married to a British citizen will be eligible to naturalise as a British citizen under Section 6(2) of the British Nationality Act 1981. If you are married to a British citizen, you will be subject to all of the above requirements however the only difference is: You do not have to wait 12 months from obtaining ILR to apply for naturalisation. You are only subject to 3 years residence requirement i.e. should not have spent more then 270 days outside the UK in the last 3 years. All other requirements apply. When sending your application, a biometrics appointment will be mandatory to attend. After applying, a decision will usually be made in 6 months, depending on the application some may take longer. Once you have received your certificate of British Citizenship, you must send your biometrics residence permit back to the Home Office. The UK allows dual nationality for its citizens however, some countries may not. In which case they can revoke your citizenship once you have become British therefore, it is imperative for you to contact your embassy before you decide to apply for naturalisation.

Skilled Worker Visa

Skilled Worker Visa The Skilled Worker Visa enables qualified overseas professionals to live and work in the UK for an approved employer. Whether you have received a job offer from a UK business or an employer is looking to sponsor international talent, obtaining the correct visa is an essential step towards working and building your future in the UK. Our experienced immigration lawyers provide practical, tailored advice throughout the application process. We work closely with both individuals and employers to ensure applications are accurate, fully documented, and submitted in accordance with the latest UK immigration requirements. Who Can Apply? You may be eligible for a Skilled Worker Visa if you: Have a genuine job offer from a UK employer licensed to sponsor overseas workers. Have been assigned a valid Certificate of Sponsorship (CoS). Meet the required salary threshold or qualify under an eligible salary exception. Are applying for a role that meets the relevant skill level. Can demonstrate the required level of English language proficiency, where applicable. Our Skilled Worker Visa Services We provide comprehensive legal support at every stage of your application, including: Assessing your eligibility before applying. Reviewing your employment offer and sponsorship documents. Preparing and submitting Skilled Worker Visa applications. Advising on dependent partner and children's visa applications. Supporting visa extensions and changes of employment. Assisting with settlement (Indefinite Leave to Remain) applications when eligible. Providing guidance to employers on sponsorship compliance and immigration requirements. Supporting Employers We also advise UK businesses that employ overseas workers. Our team can assist employers with sponsor licence applications, compliance obligations, assigning Certificates of Sponsorship, and maintaining ongoing compliance with UK immigration rules. Why Choose Our Immigration Lawyers? UK immigration rules are subject to frequent changes, and even minor errors can lead to delays or refusals. Our legal team provides clear, practical advice tailored to your individual circumstances, ensuring your application is prepared with care and attention to detail. From your initial consultation through to your visa decision, we are committed to making the process as straightforward and stress-free as possible. Speak to Our Team If you are planning to work in the UK or require advice regarding a Skilled Worker Visa, contact our immigration lawyers today. We will assess your circumstances, explain your options, and provide expert legal guidance to help you achieve a successful outcome.

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OUR TEAM

Meet Our Legal Team

20+ years

Lkhagvasuren Zuunasan

Director & Senior immigration advisor

Lkhagvasuren Zuunasan is the Director and Senior Immigration Advisor at 100 London Law Firm. With more than 20 years’ experience in UK immigration law, Lkhagvasuren Zuunasan provides clear, practical advice and representation across visas, settlement, nationality, human rights and complex casework.

As an OISC-regulated immigration adviser, Lkhagvasuren Zuunasan undertakes specialist casework and advocacy — including Immigration Tribunal appeals and administrative reviews — and is known for combining professional expertise with genuine care for clients and their families.

Whether you need help with a family or work visa, settlement, nationality, sponsor licensing, or a refused application, Lkhagvasuren Zuunasan and the team at 100 London Law Firm will guide you from first instruction through to completion.

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TESTIMONIALS

What Our Happy & Amazing Satisfied Customers Says

5.0

“100 London Law Firm guided us through our spouse visa application from start to finish. They explained every step clearly, kept us updated throughout, and our visa was approved without any issues. Highly professional, responsive and genuinely caring — we would recommend 100 London Law Firm to anyone.”

5.0

“100 London Law Firm was a beacon of hope for my wife and me when my immigration process became too difficult for us to handle. Not only did they meticulously help us through every step of the process, their professionalism, patience and follow ups offered emotional support to both my wife and me. We are eternally grateful for their service and recommend 100 London Law Firm without reservation.”

5.0

“I am writing to thank 100 London Law Firm for their services as I found them excellent with my wife's Further Leave to Remain, Indefinite Leave to Remain and British Citizenship. I found them easy to contact if I had any questions or worries and their rates were very reasonable. I will be very happy to recommend 100 London Law Firm to anyone who asks.”

5.0

“100 London Law Firm was a great help when it came to renewing my residency permit. They kept me up to date with everything that was going on and any correspondence with the Home Office. The service I received was great and much appreciated and their constant communication with me made me feel at ease. I will definitely be using 100 London Law Firm again when I have to renew my visa.”

5.0

“The school were put in touch with 100 London Law Firm to help with the process involved in granting a Tier 2 (General) sponsorship for a member of staff. I cannot recommend them more highly in their approach. They were extremely professional, calm and patient! They went out of their way to explain the process step by step.”

5.0

“We were lucky to have found 100 London Law Firm. The team was very helpful with our immigration process and their efforts and professionalism helped us achieve our most important goal, which was being together and building a future as a family. We always felt they were at our side every step of the way.”

Read our insightful latest news and blogs

Work Visas20 Jul 2026

How to Apply for a Skilled Worker Visa in the UK: A Complete 2026 Guide

Family Visas18 Jul 2026

Spouse Visa UK 2026 — Everything You Need to Know Before You Apply

Immigration Appeals16 Jul 2026

UK Immigration Appeals — What to Do If Your Visa Has Been Refused in 2026

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Secure Your UK Future With Bespoke Legal Solutions

Bespoke solutions forinvestors & professionals