Cheers guys - for those not on face blag here's a you tube video.
Sounds like a tractor - no exhaust sealing paste, and engine is burning off a lot of "releasing fluid, Wd40', transmission oil, and blood"
It starts first time now - still sounds like a tractor - have a new oil light sensor to install .
https://www.youtube.com/watch?v=5Ca2B5Bo_m4