Law firm Thomson Snell & Passmore has increased revenues by 16% in the first half of the year to £9.8 million.

However, the Tunbridge Wells and Dartford-based practices were cautious about beating its turnover of £18.9 million for the year to June.

Chief executive Simon Slater said the firm remains “realistic” about the second half of the financial year, when Britain is due to trigger the formal process of leaving the EU.

Increases are reported across the business – which is the world’s oldest law firm – with double-digit growth for the private client practice and a rise of more than 20% in its commercial group.

Mr Slater said: “In a post-referendum world, we are quietly pleased with the momentum being maintained across the business.

“Our strategic investments are paying off, particularly within the commercial practice, and it is a testament to the quality of our private client offering that growth across the firm continues to be so strong.

“We remain realistic about the second half of the financial year. Continued uncertainty around Article 50 may yet have an impact, however as the world’s oldest law firm we pride ourselves on being a constant in times of uncertainty so hopefully this will stand us in good stead.”