It depends how heavy the envelope is, and whether you're talking about the small 1st class stamps or the large letter ones. Small ones are now worth 46p each, large letter ones 75p, if you've got the ones without prices printed on them then their value has gone up as well, and I've not managed to find a postage rate among the new ones anywhere in the world that the same number of non-priced stamps won't work for exactly the same as they did before.

The rates for airmail letters are as follows:

up to 10g - 76p
up to 20g - £1.10
up to 40g - £1.65
up to 60g - £2.07
up to 80g - £2.51

If you're sending a large envelope with your own photo(s) and it weighs between 61g and 100g, write "small packet" in the top left hand corner and it will cost you £2.07. If it weighs more than that use lighter stationery, or remove the house brick.

You will need a customs form, which you can either pick up at a post office or print off from the Royal Mail website, write "photos" and value zero in the relevant boxes. You can use small packet to send goods with a covering note.

I've been argued with before that this is against the rules, but according to the Royal Mail website it isn't (I posted the url which specifically states this in a recent thread). Some UK post offices apparently don't understand their own regulations, so sort the envelope out yourself, put it in a post box and save yourself an argument.

Good luck.

For postage to the US following price rises I would recommend 3 1st class stamps- 2 might be enough but I wouldn't risk it.

UK stamps will not be accepted by the US on your return envelope so you will need to sort out return postage.

If you need any more help just ask!

Hi, i want to get a signed picture from christina aguilera. How many british first class stamps would i need on the envelope? And as you probably all ready know, i'm from the UK.