Why not buy the original HTC charger, like this one: Genuine HTC CC C200 Micro USB Car Charger: Amazon.co.uk: Electronics
(no guarantee—there are some fakes on the market).
Or buy this adapter, which makes all good chargers workable:
In fact, I have bought this from the German site:
I can attest that it solves the problem. I suppose this is the same one as that on the Amazon UK site, but cannot be sure.
What you can do is buy a charger first and test it. If it gives you only "Charging (USB)" then buy the adapter.