Does anyone know a cheap way of sending a 20kg box to the UK? So far the cheapest I've found is oversea using China post. 208 Rmb for the first kg +22rmb per additional kg. Did anybody know of any dedicated companies that do this? Time isn't a factor in my case. Thanks

If its price then what you're saying seems the cheapest option.

If you need a bit of piece of mind then a company like Luggage Mule or Send My Bag may be the way to go. At least that way it can be tracked and if anything happens, someone is responsible. This comes at a price but nowhere near the price quoted by delivery companies. For 20kg you may be looking at 700元 perhaps.