Hi,
I can confirm that The Globs played at Meigan Fayre in the Preselly Mountains in West Wales in 1975, who along with Steve Hillage and Gong, were one of the main reasons that I went. Check out the website for the festival and the whole line-up is displayed.
I still have an official Festival T shirt, though it is a bit motheaten now, but MF stands in my memory as one of the great festivals of the 70's. It was small but the atmosphere was amazing, and the locals, who were reticent at first, gradually warmed to the atmosphere and the freaks, and we all ended up partying together.
Happy daze!
Kevin Ball