S-H and HOODED,
Lets not forget though that most, if not all, of the extensions have been achieved simply by taking away the extendibility (?) option on servicings
e.g
on the GR4, Primaries were done around 150 FH but could be extended out by 37.5%. Now Ps are done at 206FH and are unextendable.
That's certainly the case on GRs anyway.
JG