More than one in 10 cases dealt with by magistrates last year involved people accused of watching television without a valid licence, according to reports.
Nearly 3,500 people a week appeared before the magistrates' courts, more than 180,000 a year, accused of watching television illegally.
A total of 155,000 people were convicted of not having a valid licence – costing up to £145.50 - and fined last year.
The maximum penalty for non-payment is a £1,000 fine in the UK, but refusal or an inability to pay the fine can result in prison.
In recent years, at least 70 people are said to have been jailed for non-payment of such fines.