Just be wary of automated translations, sanity check the results to be sure they make sense before purchasing. Be aware that the return policy is that of the country of the store you're purchasing from. Most EU consumer rights are broadly similar, but are not necessarily identical to those in the UK. It's up to you to check first. Some items may not be available for shipping outside the country the Amazon store is based in - I ran into this with a set of brass reduction gears that was only available on Amazon.de but the seller only had the sales territory rights to Germany and wouldn't ship to the UK (fortunately I also have access to several German postal addresses!).
Your .co.uk account is universal and should work on any of the Amazon websites worldwide.
I've used .de several times without problems, and I think I may have used .co.jp once.