I need someone to recieve and forward a letter

Hi - slightly odd and very straightforward task here. I'm travelling at the moment, and I need to get a UK government document forwarded to me. They will only deliver to an address in the UK.

So I will call them - ask them to send the blank form to your address - and I want you to put the letter in a new envelope and take to the post office and post - I will issue the Royal Mail label.

Very simple - but need a trustworthy and reliable person to do it.