I ended my membership at 37 degrees and joined the bankside health club as it is much closer to my flat and cheaper, it is brilliant. I also have the personal training sessions which are the best I have had (in the past 10 years have had 4 different trainers!) The people working there are very friendly, they have lots of classes, power plate, spinning, sauna and steam room etc. It is definitely worth checking out!
I am not affiliated with them but they currently have an end of month offer - 4 weeks for £35. I have unwillingly gotten on their text message distribution list as I made some enquiries so I get text messages about all their offers.
Anyway, regarding price, a few weeks ago they offered me £50 month for 12 months membership or £25 month (off peak) for 12 months memebership.
However I didnt join as I was looking for a pay as you go gym.
Looked into joining back around Christmas but they hadn't really built anything yet. I'd imagine they can be squeezed on the price of memberships (esp. off-peak) as Bankside 2 & 3 haven't opened yet, and AFAIK the Blue Fin isn't full to capacity yet.