Thanks everyone, there are some on here I’ve tried, and don’t fit my bum the DHB aeron and Endura FS260, both lovely made, but the Endura FS260 have never fitted me well, weirdly the Xtract fits me better, but I don’t think the pad’s up to much, and the Aeron, likewise feels weird. I’ll have a look at Rapha as one of their Clubhouses is near me and having a look on their websites, the Lusso and 7mesh share the same pad, so might give the Lusso a go as well.
A roadie friend of mine rates his Castelli Free Aero, they might be worth a go as well.