Envelope A is the envelope that the elector returns their ballot paper in
Envelope B is the envelope that the elector will use to return the ballot paper envelope and the declaration of identity.
The declaration of identity contains the elector’s name, the number of the ballot paper issued to them, instructions on how to vote by post and space for the elector to sign and provide their date of birth
The ballot paper
Quick guide which explains how to complete the postal ballot
If the election is combined with another poll, the Chief Electoral Officer may have decided to combine the issue of postal votes.
In that case, the postal ballot pack will also contain the ballot paper for the other electoral event(s).