Thanks Tony.

I dunno whats best to do I got a nearly new downpipe earlier this year so I know that part is ok, but what with the cold mornings and her already having a cold start problem I think i've managed to wake up everyone in my street for the last week.

I think what i'll do is replace the whole exhaust (minus downpipe), then try and find a new warm up regulator (thanks to Chris for the part number ) then see how she runs.
The person you know with the Mongoose, is it defo the same as the original (ie up & over rear axle)? And what bore tail pipe does it have? Is it in good condition for that price?

I'm supposed to be booking her in for the respray soon but I think i'll put that off until I can sort out the niggly problems (namely the bloody leak in the boot!!!).