My sincere thanks to everyone for their input.

We have decided to completely strip out the present toilet arrangement
and go for a new one that is higher, all that needs to be done is
compare prices through all those links provided.

The seat raisers were a no go from the start because they are always
there with the seat and lid permanently raised, pain in the a...
especially if guests are present!

Thanks again we really do appreciate the help.

Peter Charles Fagg