Well, mainly good news today!
After a couple of tries to get the car running properly, a fuel filter change seems to have sorted out the pulsing issue.
First tank (the 75mph drive home then running about town) came in at 39.2L for 410 miles- not too bad with the excessive speed and running issues.
This may have contributed:
A full write up of the shenanigry can be found here:
https://fuguttycars.wordpress.com/20...listen-to-dom/