kimmylee wrote:In the UK size limits only apply to inland mail. So anything going out of the UK, is priced by weight only.
up to 20g: £0.97
up to 40g: £1.46
up to 60g: £1.98
up to 80g:£2.51
up to 100g: £3.04
So I hope your letters got there ScottishDan ;) I have no idea how insufficient postage would be dealt with when it crosses countries.
It's not quite as straightforward as that.
You can send photos and, IIRC, "a covering note" from the UK to the US up to 100g for about £1.60 (the Royal Mail website is down at the moment, and it is horrible to use at the best of times, but the rates are on there), if you write "Small Packet" on the envelope. It will help to use a customs form, on which you write "Photograph(s)", and no value. Two 10x8 photos, a letter, a return A4 envelope, a sheet of not-too-thick card and the envelope it's sent from the UK to the US in weighs in at less than that when I do it.
Over 100g it costs a bit more, but cheaper than airmail. Works for anything over 40g.
The cost of postage is going up in (I think) April, so if you are able to get 1st or 2nd (either large or small letter) stamps without the prices on they work like US Forever stamps.
If you send something in the UK to overseas with insufficient postage, they get returned to sender with a sticker on telling you to take them to a post office to pay the balance and re-send. Given how few celebs put their home address on the back, or are likely to pay excess postage, they will end up at the sorting office and sent off to be destroyed (according to the guys at our local sorting office). Not a good idea to send an SASE with insufficient postage to the UK.