Mod Edit - These are not recommendations on forwarding services, and you use at your own risk, but feel free to post about any forwarding services that you have used

I have successfully used https://www.forward2me.com/ two times in the past, and are currently in the process of using them a third time (all for UK only Ebay auctions). To get my money's worth, I tend to take advantage of the 30 day free storage to get more than one book at a time. I am not affiliated with them in any way, just stating my experience with them. Disclaimer: my experiences are mine only, and your mileage may vary.