Fuck this sccm PXE boot. Reinstalled WDS and PXE service point (WDS had a bunch of stuff configured and images set up and everything I was reading said that it shouldnt). Things were going well, everything seemed to install fine but then when testing get some annoying abortpxe.com error. Google shows a lot of fixes for that which I try and seems to fix it and instead I get some other error at the same stage. All seeming to ask for admin approval before the PXE download will continue, so I dig through a pile of more links and posts and can't find any solution to this nor any setting that I could possibly have put in place to require approval when trying to PXE boot an unknown computer.
Thinking about contacting some of the other schools in the area who have the same system and finding out how their's is set up to try to work out what else I'm missing.