Gambled on a second hand frame that needed new pivot bolts and bearings; purchased these and have test fitted the bolts while waiting for the bearings to arrive and discovered the rear (FSR) linkages are bent. I was able to get the frame together by putting the bolts in in an order that allowed me to fit the bolts to the easiest bit to pull on last and the frame builds up straight. But obviously the whole rear end is under a significant lateral load all the time.
It is the drive side FSR pivot that shows the bend, the two halfs when matched up are significantly out of parallel with each other when not held in place by all the other bolts, when built up this pivot is going to be quite stiff, the suspension action is very stiff now, though I don't know how much of that will be alleviated when I replace the bearings. I suspect not enough.
Anyway, that wasn't my only mistake; I paid cash on collection. I'm going to contact the seller about getting my money back, but not really sure how the ebay complaint process works if you didn't pay with PayPal; how do I get my money back if the seller just ignores me?
Cheers in advance, try to resist the urge to point out my mistakes as I'm already aware of them.

