Pam Watson, KM Manager at the Bank of England has recently created a Knowledge Management - Financial Sector Collaboration Group on LinkedIn.
You can join here
She has a few members already but it would be good to grow it into a thriving community.
Or if your KM interests are broader then you can join my
Gurteen Knowledge Community Group
Also watch out for a London Knowledge Cafe specifically for the Financial Services sector in the next month or two.