The sad truth is, the Liverpool group shut down a long while ago in response to a lack of members. After bravely meeting monthly for a year they still only had five or six people each session, and understandably decided to call it a day. The website has been frozen with out-of-date information including a duff phone number, and a no-longer-existent PO box, as sadly happens often with websites.
The website of the Liverpool bisexual group, Mersey Bis, has been updated after a long gap.
The sad news is that it reports that the group is wound up, and they are encouraging anyone from Merseyside and surrounding areas who would have been interested in the group to go along to the Manchester bisexual social-support group instead.
It's even more of a problem where the group runners don't know one another through the peer network of the UK bi scene. I have no idea whether Colchester group is still going, for instance, and suspect that BCN was listing the Newcastle group for twice as long as it was running.
That said, I don't know how we can really improve on the situation.