Since Ofcom was created in December 2003 there seems to have been a decrease in the amount of enforcement action for breaches of the radio spectrum regulations

Page 12 of the October 1985 edition of the UK's Ham Radio Today magazine shows the high level of prosecutions that used to take place when communications regulation was carried out by the Department of Trade and Industry (DTI).

In 1984 there were 1281 convictions relating to the illegal use of Wireless Telegraphy equipment and just the first three months of 1985 showed 242 convictions, see
https://worldradiohistory.com/Archive-DX/Ham-Radio-Today/80s/HRT-1985-10.pdf

In 2010 Ofcom stopped the annual publication of their Prosecution/Formal Warning Statistics and removed the historic prosecution statistics from their website. This action made it harder to determine if Ofcom were still carrying out any radio spectrum enforcement action.

You can still see some of the historic prosecution figures in the Internet Archive at
https://web.archive.org/web/20100608131503/http://www.ofcom.org.uk/radiocomms/ifi/enforcement/pstats/