....unless its multipilot (eg London), then its annual until 60, when it becomes 6 monthly.
NO, NO
In the UK, unless you are working at London HEMS, it is classed as a "Single pilot air transport operation carrying passengers". In which case:
If you are under age 40 it is every 12 months.
If you are age 40 - 60 it is every 6 months.
You cannot fly single pilot if you are 60 or over.
If you are working at London HEMS it is a two pilot operation. In which case:
If you are under 60 it is every 12 months.
If you are age 60 - 65 it is every 6 months.