Oh my gawd I agree with The Domskie:
Castle Coombe is OK and who said drop Cadwell!! Wash your mouth out.
Oulton is a belter and my favourite circuit - sort of a longer wider Cadwell (not so good for the local curry houses though) and should definately be in.
Pembrey is a chalenging place and would be in my list - no long striaghts so probably good for the DDs as well. But it is Wales so it WILL be wet.
Likewise Brands GP was a stonker when it had Dingle Dell but haven't ridden it since they pi..ed about with it.
So in summary:
Cadwell
Pembrey
Oulton
Donnington
Lydden - there's a surprise and won't happen 'cos it's BEMSEE - but would work well with the little Duk's.
Brands (either)
C.Coombe