Stanleysteamer said:

Glad you seem to be happy with it. Last thing I can think of is that the stuff the spring mounts are connected to has rusted and given a bit. But if you've already checked these then this won't be it.
Oh and also accident damage.Wrinkled bits of steel anywhere on either chassis, gulp, or body work, only visible on the inside of the engine bay.
I think these are unlikely.

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Bantam1 said:

Thanks, but chassis is excellent and all intact, no signs of accident damage or anything.
I'll have another crawl about and think about it when this wind and rain next stops.

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Bantam1 said:

OK to close this thread down I can now report that I have fixed it and it sits level.
I have been measuring from the spring seat to the isolator on all four corners.
When I corrected the worst measurement on the rear the front corrected itself. I did this by jacking between the axle and chassis until both measurements were equal.
Therefore the permanent fix (for this set of springs at least) has now been to weld an 8mm plate below the spring seat and on either side where it seems to bear on the axle.
The difference was measured at approx 10mm on the rear so the 8mm plate should have reduced that to 2mm. The car now sits nicely and the front is spot on.

The true root cause? Could be the spring kit or it may be that (as some rumour) the drivers side springs on OEM are normally slightly longer and these were not.

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