Sending money through mail?

Yes, you can send money in the mail but there is a change that someone could steal it. so i would put some insurses on the mail you are sending

 

get a small box (shoe box) put the money in it. Wrap it up and sent it

 

Sending money through the mail obviously has some risk involved. The most important thing to do if you are certain you want to send cash is to make sure to use high denominated bills (which make the package as thin as possible), and also make sure to cover the money so that it can not be seen through the enveloppe. The best way to do this is either an old card, or by a few pieces of paper. Do not over-wrap either, thin and opaque is the effective way of doing it. A piece of tape to secure it shut never hurts either.

"PS - ALWAYS put a return address on"

I've sent 400+ USD to R2P in the past few weeks and never put a return address on it Luckily all the cash I send R2P got to him within 5-7 Days.
Oh and I'm from the U.K too.