Not much if you want the honest answer.
When I first joined UKBF a couple of years ago it was a fantastic place to get in touch with some very experienced and trustworthy (due to the many recommendations!) people. Steve Gibson on here played a key role in me turning what was a slow business into a money making full time company (but don't tell him, I reckon his heads getting too big!

).
I was happy to pay the £36, one to pay a little something back and also to try out the sig links. The problem is I have never used UKBF to get clients and business, so for me after a few years the whole forum is beginning to have less and less appeal to me. I still read the forums as there are a lot of very knowledgeable folks on here, but I doubt if I would pay for membership again. For me, there are no benefits to it.