Didn't quite understand what you mean by that you are not sure why you bother.Not sure why I bother, also the guy has not specified that he is NOT physically present in the jurisdiction he wants to bill to in order to deliver his services.
.Withholding tax around the world - DLA Piper Guide to Going Global
www.dlapiperintelligence.com
I have not heard about countries having a withholding tax on payments for services. And, even if I wouldn't think EU membership would matter in that case. Also the UK has many tax treaties.
So if you know of what countries impose a withholding tax for services then I would be interested to know. Thanks.