Electors with a postal vote arrangement in place for a particular poll who decide they want a proxy vote arrangement instead may change their voting method by submitting a fresh proxy application by 5pm, 11 working days before the poll. This proxy arrangement would replace the earlier postal vote arrangement.
Postal voters with a longer term postal vote arrangement may change their voting method from postal to proxy at any time up until 5pm, 11 working days before a poll to be effective at that poll.1
The exception to the ability to change a postal vote arrangement to a proxy arrangement is where the completed postal ballot paper has already been returned by the elector for the poll.
Our guidance on applying to vote by proxy has more information on the contents of a proxy application.