Re: people from uk give me advice
Post Office is fine, there are two options: signed for recorded, or standard. Price difference between the two is huge, £2 standard, £7 signed for recorded. Prices increase per extra 15g or so.
Use Signed for recorded if your sending cash. I sent 3 items with the following experiances: a birthday card non signed for and it arrived after 14 days, an Eid card non signed for and it never got there, a letter signed for and it arrived after 12 days.
Make sure you write the address correctly and clearly, and package the item simply but securly.