Hi it,s me again.I am about to send my son's ESA50 back and I have several other pieces of evidence to include (most of which are A4 size) and have just realised that I cannot get all of the paperwork in envelope that the DWP supplied (A5 size) Would it be acceptable to stick their envelope (1st class prepaid) on the front of an A4 envelope and send it off like that - and of course send it registered mail. Thanks
