Rogers Stirk Harbour & Partners has said more and more of its EU staff are looking to get British citizenship in order to head off the threat of being thrown out of the country because of Brexit.

The UK is due to leave the EU on March 29 next year but the practice said the “ongoing lack of clarity” over Brexit has meant its EU employees are taking matters into their own hands – rather than relying on government assurances they won’t be kicked out.

In a note accompanying its latest report and accounts, RSHP, which has more than 200 employees on its books, said: “A significant portion of our non-UK staff [is] seeking to naturalise and obtain UK passports where possible.”