At the moment we use a combination of Royal Mail, Spring Global Mail and DHL. Generally you will find Spring Global Tracked Mail is cheapest for International Deliveries, but they do take a day longer to arrive than Royal Mail. This is because it's part of the PostNL, the Netherlands Postal Service, so everything is sent from the UK to the Netherlands overnight for sorting. The only countries where Spring Global get beat on price are Germany by FutureProof and USA by e-tail to USA. The only thing that slightly puts me off these 2 services is that you don't stick the tracking on the item at source. You send your parcels to them and they email you with the tracking numbers later that day (with e-tail USA) and the next day with FutureProof. This obviously causes a slight delay in uploading the tracking numbers to the various websites. You can overcome this by changing your dispatch time to 2 days on Amazon and eBay. But as far as I can tell you have to change the dispatch time for all orders on eBay (not just international ones), so you would lose the "Get It Fast" option from your UK listings.