As of tonight the climbing wall at Sparsholt College is now open to the public... on Tuesdays 18:00 - 22:00.
I went along this evening and signed up (didn't have time to climb though) but I was the only one there. I'm guessing no one else knows about it yet so I thought in my own interests I would give them a bit of publicity on here in the hope of finding someone to climb with.
https://www.sparsholt.ac.uk/college/climbing-wall/