HA!
The TV came out of the cabinet again today. After pouring over the circuit and reading an old Practical Television article, found R103 on the frame circuit had gone from 150K Ohm to 205K ohm so as over it's 20% changed it and now have better frame linearity and the adjustment pot is near mid range.
The mains plug from eBay arrived, not sure on using it, It is quite loose on the smaller of the two mains pins, and despite one hole being slightly smaller then the other, the plug will go on both ways.
I am going to try and fit a paxolin washer inside to reduce the opening so that it could only ever fit one way round. I could also fit some heat-shrink to make the fitment a bit tighter. Wonder if anyone can confirm it this is the type for the Ferguson or another make of TV, I suspect a PYE plug?
It was a gamble on being the correct type so not trying to knock an Ebay seller.
Adrian