MORE than 1,540 people in Hillingdon were caught watching TV without a valid licence in 2011.
The figures compare with 1,160 in the borough of Harrow, 1,850 in Hounslow and 2,560 in Ealing during the same period.
Although TV Licensing caught almost 390,000 people watching TV illegally across the country last year, the estimated evasion rate remains steady at about five per cent.
Pauline Gillingham, of TV Licensing in London, said: "TV viewing is as popular as ever, with 96.7 per cent of households owning a television set, and it's our role to make sure everyone is aware of when they need to be covered by a licence.
"On behalf of licence fee payers, we are committed to tackling evasion and enforcing the law among the small minority who should pay, but don't."
A colour licence costs £145.50 for 12 months and is required by anyone watching or recording programmes as they are broadcast. The penalty for not having a valid licence is a fine of up to £1,000.
Detector vans and handheld trackers can be used by enquiry officers to check whether someone in an unlicensed property is watching TV illegally, but the database is the main enforcement tool.