CMS has announced that its turnover has grown by 8.4 per cent, from €934.5m (£678.3m) to €1.01bn (£735.2m) in 2015.

The results follow on from similar results during the previous year when the firm’s revenue increased by 11 per cent, from €842.1m to €934.5m.

Profit has also increased by 6.8 per cent compared with the 2014 financial year. CMS did not provide a net profit figure but based on the previous years’ results this is estimated to be £257.7m.

CMS UK senior partner Penelope Warne said: “Although Brexit has presented some challenges and uncertainty in the UK market, we have maintained a strong and successful business. We continue to prioritise our clients and are seeing growth across our core sector and practice groups. We are positive about the year ahead.”

The firm recently became the first international firm to open its doors in Iran after sanctions against the country were loosened earlier in the year. The Tehran office will be ran by partners from the firm’s German arm, CMS Hasche Sigle.

CMS has also undergone a major leadership change after Duncan Weston announced he was stepping down as UK managing partner in order to take up a new role as executive partner for global development. The role involves taking responsibility for the firm’s strategy including its international expansion.

Weston was replaced by corporate partner and oil and gas specialist Stephen Millar.