Re: Am I a wrung'en?
The security for my online banking serves two purposes. Firstly, it stops others from seeing what transactions I am carrying out. If, as you suggest, the authorities are able to demand that banks hand over the transaction details afterwards, this still means that no-one else can spy on me. The banks probably don't care one way or the other.
Secondly, it stops me from turning round to my bank and saying "I didn't do that". I really, really doubt that the banks would be happy with that. If Dave really did manage to enforce a ban on encrypted connections within the UK, the City of London would have to find another country to exist in. I really, really doubt that Dave would be happy with that.