Hi Paul Turner have you already tried and are receiving an error or are you asking in advance of attempting the connection?

If you haven't attempted the connection yet I would just work through the wizard and see if the bank is there and whether you can get the connection working as its a pretty simple process and easy to undo.  Also the Bank Feeds won't change anything in the regular Reconciliation screen so adding the bank feed won't break anything.  As to cost, in my region (Australia), Sage pay any of the fees so there is no cost to the client. I do not know if this is the case in every region so maybe check with your local Sage Business Partner, Consultant or regional office first if you don't know.