You really need a surgeon which specialises in salvage prostatectomy, because it's highly specialised and rare.
In that other thread, the one who was at Guildford has since retired from the NHS (but still works privately). The one mentioned at UCLH is now at Guys and St.Thomas's. There may be others, but the one at Guys and St.Thomas's is the only one I know of on the NHS, and I've seen other London hospitals refer to there for salvage prostatectomies. If that's within reach for you, I would ask for a referral to there.