How to ensure switching coincides with end of contract?

Serendipity

I can't seem to find the answer to this anywhere, so apologies if this is an old question...
My existing energy supplier's contract finishes at the end of February, but they have a £60 exit fee if I leave before then.
How do I orchestrate the switch so that the new supplier takes over on 1st March? Or should I wait until, say, a week before the end of Feb before starting the switch, and live with a week of the old supplier's post-contract higher rate?
Thanks for any guidance

Nada666

Apply from 49 days before the end of your fix and later - the supplier is then obliged to continue to extend the fix until the switch has been completed and to not charge an exit fee. Or wait a week or three extra.