Are you buying it through
ebay? Some UK sellers are incredibly obstinate and insist on
ebay's international shipping program, which is highly reliable but costs around 12 pounds per item with no combined shipping. Others stoically refuse to do any kind of shipping adjustments and feel like the shipping cost is completely out of their hands.
But most British sellers will post through regular, unregistered mail for 3-5 pounds if you ask them for that method. There's always a risk but it's perfectly fine for things that aren't particularly valuable. Over the past few months, I've bought a whole bunch of things from the UK with this shipping and I don't think I've had any incidents.