In all they estimated that there were 60,699 converts living in Britain in 2001. With no new census planned until next year, researchers polled mosques in London to try to calculate how many conversions take place a year. The results gave a figure of 1,400 conversions in the capital in the past 12 months which, when extrapolated nationwide, would mean approximately 5,200 people adopting Islam every year. The figures are comparable with studies in Germany and France which found that there were around 4,000 conversions a year.

Fiyaz Mughal, director of Faith Matters, admitted that coming up with a reliable estimate of the number of converts to Islam was notoriously difficult. “This report is the best intellectual ‘guestimate’ using census numbers, local authority data and polling from mosques,” he said. “Either way few people doubt that the number adopting Islam in the UK has risen dramatically in the past 10 years.”

Asked why people were converting in such large numbers he replied: “I think there is definitely a relationship between conversions being on the increase and the prominence of Islam in the public domain. People are interested in finding out what Islam is all about and when they do that they go in different directions. Most shrug their shoulders and return to their lives but some will inevitably end up liking what they discover and will convert.”