Glad it was that simpleHold the phone ladies and gents. I'll apologise for this.
Someone mentioned the earth strap but i was clearly looking at the wrong thing. I brushed past it with my arm and it just disintegrated. I used a jump lead tto connect the battery to the block and bosh! ut's up and running.
Apologies for missing this at the start, guys - thanks for everyone who replied and didn't judge! I can build you a data centre but apparently basic car mechanical / electrical functions are beyond me!

to be honest...
It was the Padlock that was fooling me,
Obviously several systems were reliant on the Chassis to Motor path

All good to know
