I alternate between the 1p/day and 1p/day reverse challenge each year (so I don’t suddenly leap from 1p to £3.65) but would rather like the money to go to an external, interest paying account rather than into a pot.
How much to you save over a year? Why don’t you just make life easy for yourself and divide that amount by 12 and save monthly into the account of your choice? You’ll get better rates on a Regular Saver, too.