Thought I could give some more of you some hope, my phone has FINALLY decided that it would like to be more than a paperweight for the rest of its life and started working again after 2 weeks!! Ironically the charger managed to performed some CPR magic the day after a reply from HTC admitting there was a problem and recommending I take it to me repaired where I bought it. Which was worrying as I'm now living in Australia and bought the phone in the UK on ebay!!!
Anyway I think differed gratification has to be used with this issue, I ended up using a VERY old Samsung with tape and chunks of strategically cut paper to hold the sim in! I'd forgotten the joy of not remembering when you last charged your phone, that also meant I'd forgotten where I last charged it, where the charger was, and that proprietary phone chargers were the worst idea since Justin Bieber.
I left the phone alone for 5 days and it started vibrating when I pushed the power button! So I excitedly put the phone on charge. 48 hours later nothing had happened. So I took the phone off for another 4 days. Plugged it in, after 24 hours it had managed to achieve absolutely nothing. So I debated taking it apart and disconnecting the battery manually, I'm still convinced that could have fixed it. Dismantling looked complex and if it didn't work I would lose warranty so I decided to email HTC. 48 hours and one reply from HTC later it works again! I'm quite impressed with it, I guess it decided coming alive was better than having your guts ripped out and your memory wiped!
TLDR: It took two weeks but my phone lives, yay!