A high-profile British judge who resigned from Hong Kong’s highest court last week has warned the city is “slowly becoming a totalitarian state” and judges are being compromised by an “impossible political environment created by China”.

Lord Sumption’s comments on Monday came as a third senior foreign judge in the past week resigned from the Court of Final Appeal.

“The problem in Hong Kong has been building up over the last four years and I think all the judges on the court feel concerned about this,” Lord Sumption told the BBC’s Today programme.

“I have reached the point eventually where I don’t think that my continuing presence on the court is serving any useful purpose.”

On Monday he wrote in a newspaper op-ed that the city’s rule of law has been “profoundly compromised”.