Tim, I'm not sure now if you got my PM or not, so this is the gist of what I said.
fyi there's a couple of Pitts for sale here:
https://www.aerobatics.org.uk/for-sale-and-wanted
An S1T is the best variant there is imo, but a bit more expensive to buy and run than an S1S.
If you're not already a BAeA member, then worth joining and sending a message about shares out to the other members.
Good luck.
TAC