Gayno wrote:
Depressed
Ok not the gearbox then.

Could still be clutch?
Gayno wrote:I can't see how it's seized though. The first attempt to start it did turn but slowly as the battery died. Then when trying to jump start it did this?!
I agree, it sounds completely ridiculous and I thought I'd look like a complete knob for saying it! But from your description, that's what comes out???
Have you got a socket you can stick on the crank nut to try and turn it over by hand whilst in neutral, or with the clutch depressed?
If you can't turn it, then whip the plugs out to see if it's hydro-locked somehow???
(seriously, I can't actually believe it's a siezed engine...)