Sophie St John works closely with UK resident and international individuals, their families, family offices, and trustees. She advises them on a wide range of UK legal and tax issues relating to estate and succession planning, wealth holding, and preservation structures such as trusts, UK tax planning, and probate. Her advice extends to inheritance tax including related double tax treaties, residence, domicile, the creation and operation of trusts, wills, and lasting powers of attorney.

Sophie particularly focuses on advising internationally mobile individuals and families with a global footprint on issues relating to cross-border planning. This frequently involves liaising with other qualified professionals in relevant jurisdictions to coordinate cross-border advice.

Sophie is recommended in the 2024 edition of Spears 500 and is praised in Chambers 2025 for her “very personable and responsive” approach. She is a member of both the Law Society and the Society of Trust and Estate Practitioners (STEP).