Whenever I've had to forward any unopened mail I've just readdressed the envelope and stuck it back in a post box without paying any more postage.
Usually this works although earlier this week one letter "bounced" and came back to our house despite my attempts to obliterate the old address.
What I've never been sure of though is the what the rules/laws are regarding postal charges. I've always assumed that for standard letters there is no charge. How about bigger letters or parcels?
I've tried googling but that just seems to throw up info about Royal Mail's paid for forwarding service (after a house move say)..
Just what are the rules? Are they online anywhere?
Tim