A Hammersmith centre which conducts thousands of citizenship tests a year has one of the best pass rates in the UK.

The Iranian Association, in King Street, has the seventh highest pass rate, with 84.1 per cent of people taking the Life in the UK test there over the past three years passing.

Working age immigrants wishing to become British citizens have to pass the test, and with a pass mark of 75 per cent, most native Britons would probably struggle to pass the test which asks difficult questions about British history, the constitution and culture.

Figures obtained by getwestlondon from the Home Office show tests taken through The Iranian Association surpass the national average pass rate of 76.8 per cent.

With 17,280 people passing the test there from 2011 to 2013, it is only beaten by centres in Wimbledon and Islington in London.

Kaveh Kalantari is manager at the association which also runs English language courses, a welfare and immigration advisory centre and activities for all nationalities.

He said: “The test is taken through the centre but it’s online so unfortunately we can’t take credit for training people. The high pass rate is most likely because we’re in an affluent part of London. We get many businesspeople from Kensington and central London doing the test through us, they’re well educated so it’s likely they will pass the test.”

Surprisingly for a country which could soon become independent from England, the Lifeskills Centre Aberdeen has the highest pass rate overall, with 91 per cent passing over three years.

The Life in the UK test - which has an official handbook to help prepare - costs £50 to take and can be taken an infinite amount of times.