how much to leave in an account, just in case in the future they have deals for customers

Bridlington1

Kim_13 said:

The majority of providers including Skipton are £1.

It's generally £100 for personal notice of a rate reduction and voting rights, but that's unlikely to be an issue as you would presumably get that once the right account comes along.

A few building societies are higher - Cambridge and Dudley come to mind as not having anything that can be opened with less than £100.

Dudley's Regular Saver can be opened with £50. Also both of the above have Children's accounts that can be opened with £1, though Cambridge requires you to be under 21 to open it and Dudley under 16.