Ben,
That site might not be using a CMS, or it could be using something proprietary. A quick look at the source doesn't reveal tell-tales from any of the CMSes I'm familiar with, but does indicate the site was built by Blue Line Media, also in Cheltenham. You might want to contact them with an inquiry.
Micah
Hi there
I can not work out what was used to create this site - any ides?
http://www.whatsonincheltenham.com/
Thanks in advance
Ben