Dear Mr Frog,
I think you will find that whe you renew your CAA ATPL(H) that it will only be for valid for a further 5 years,
the CAA changed all professional licences to 5 years back in 2000, even before they started issuing JAR ones, as my original CAA CPL(H) was for 5 years when I had expected 10, I phoned up to bellyache and was told all licences now for 5 years.
Regards
CF