terryjones (are you the Python Terry Jones?),
You will need to do the following:
1. Obtain a JAA Class 2 medical certificate from a CAA AME.
2. Do whatever training you need to be ready to take the Renewal Licensing Skill Test for the Single Engine Piston (Land) Class Rating.
3. If you can show (e.g. logbook proof of flying training) that you have exercised the privileges of your RT licence within 10 years following the last date of your licence's validity, then you shouldn't need to renew your FRTOL.
4. You will have to pass.........
......NO PPL exams! Unless, that is, there is some quibble over your RT licence.
5. The Rating variation fee is currently £70. You will need to send your Licensing Skill Test form, medical certificate, the fee and your licence off to the CAA.
6. You may not fly any passnegers until your licence comes back from the CAA and you've signed it!
Enjoy your 66th birthday present to yourself!