Baliw99.
In terms of exchange rates, some you win some you lose.
They vary day to day. Since August they have been around the 68/69 level
without any major swings up or down.
Bear in mind the govt Spending Review to be declared on Oct 20. Who know what impact that will have. Personally I feel the rate may well dip.(not in our favour)
Better to read the posts in this thread to make your own choice.
Everyone has their own logic that they feel happy with.
If you want to open a bank account I would suggest you personally meet with the bank manager together with your partner, passports (or other photgraphic ID) and evidence of permanent address.
It then really depends on the individual bank, branches and individual manager.
If the manager agrees, they will not breaching any laws.
Talk only with the manager as nobody else will have the authority to deviate from
the 'standard' procedure.
You did not mention the type of bank account, but you need to be aware of
the UK rules, especially from HMRC.