I'm not sure you'e been given the most helpful information.

Check out the Royal Mail's website - for £4.75 you can send a packet weighing up to 500 grams, with £500 insurance, next day delivery , signed-for. Wouldn't that cover all your needs?

I think you've been misled. Try them again.

Oh, and a tip for anyone who doesn't need the insurance- it's now often cheaper to send two items like CDs or thin books as two Large Letters rather than one Packet, as long as you keep the packing fairly slim.

Marje