ZZR Update:
After going through all the components that WR6133 suggested nothing stood out so in it went to GP Auto's in Cricklade. now bear in mind when I bought it, it had Service paperwork stating the Carbs had been cleaned etc.
faults found:
Pilot Jets and Pilot fuelways blocked, mixtures were lean and Carbs out of balance also float bowls and carbs were green with fuel residue
So they cleaned everything including the carb slides and diaphrams, sorted the jets etc balanced carbs and checked everything for leaks.
Bike now runs like new so it will make an appearance on a rideout.
