Well after a week of pulling my hair out she lives !!!
I came in this morning and tried the slap test as recommended to no avail, removed crank sensor again and refitted, had one of the electricians test me the relays, removed everything to get to heck the timing belt and all ok.
So thought sod it and removed the fuel pump, that was a pain in the arse. Stripped it down and drained, wiped it down then connected it directly to the battery, their was a hum but nothing. I'd only put in in for a couple of seconds with the help of a friend, I wanted to blow him up as well, so we put it back on and held it on. Their was a hum but nothing then all of a sudden it spat fuel everywhere that made up take connection off. Pissed myself layghting as it covered Pete then reconnected it, more fuel came out and air then started humming smoothly. Cleaned it all up and reassembled making sure everything was clean and connected properly. Crossed my fingers, turned the key and she sprang straight to life and has been running 30 minutes. I've now turned her off to leave her to cool and I will try her again later hoping she will start again.
It just looks like their was a blockage in the fuel pump, I'm going to order a new one anyway as recommended but I'm hoping that this may have cured it. I did notice some rust on the top cover but can't imagine this caused it as it's not all the way through.
Anyways thanks for everyone's help, it's been long winded but she lives and the that's the main thing, hopefully many more years motoring to come from the old girl.