An amazing resource, updated monthly:
UK Mosque/Masjid Directory
http://mosques.muslimsinbritain.org/
Enter any UK location or mosque name…
…or jump directly to the most popular towns: London (431), Birmingham (161), Bradford (91), Leicester (71), Manchester (63), Blackburn (45), Sheffield (36), Oldham (30), Dewsbury (29), Glasgow (28), Bolton (28), Nottingham (27), Leeds (25), Luton (25), Walsall (21), Edinburgh (20).
About: a searchable directory of all 1908 mosques and hired halls in the UK and Ireland. >A report on the current detailed statistics concerning mosques is downloadable as a PDF file. [http://www.muslimsinbritain.org/resources/masjid_report.pdf]
London area:
