Macfarlanes, Withers and Charles Russell have joined forces to lobby against proposed government legislation that could see non-domiciled UK residents paying an annual levy of £30,000 once they have lived in the country for seven years.

Partners from the firms' private client groups have teamed up with professional organisations including the Society of Trust & Estate Practitioners (STEP) to campaign against the planned crackdown on non-domiciled foreigners with overseas income living in the country.

They have held discussions with the Treasury and HM Revenue & Customs (HMRC) about the changes, which they argue contain loopholes that will make it difficult to advise clients effectively.