This reminder was written by Peter GM7NFF. Thank you!
All UK licence holders are required to revalidate their licences with Ofcom at least every 5 years. Radcom are suggesting that you pick a significant date such as your birthday and do it yearly. This would seem to be a good idea and means that you don’t find yourself unlicenced.
Ofcom do not send out reminders. It is your responsibility.
You can do it via the Ofcom website, or Email them at firstname.lastname@example.org – but if all else fails call 02079813131. I did and got a very helpful lady on the other end.