My husband and I have a joint account in TSB, we also both have current accounts there in a different branch. We opened a joint account in tsb as a current account. I would suggest that this is probably the best option, you could explain to any bank that you need joint account at this stage for joint expenses for wedding and will after the wedding be looking at tfr all use to one accout.
You dont need to say how soon after the wedding. could be years down road.
It would be difficult to get joint current without this, which you need to get cheque book etc
good luck