When the rear subframe was off and welding done, the rear ride height corrector started to leak when it was all reassembled and pressurised. It was changed for a NOS unit which the guy had in stock. The transformation on the suspension balance has been significant, restoring it to a more even quality ride. No longer is the front being pushed by a 'faulty' rear height corrector. So if you are having ride quality problems, as I described above, it may be worth flushing or rebuilding the rear height corrector.
Remember that this type of fault is slow, like losing pressure in spheres so you hardly notice it until it becomes rather significant. Also I had done not insignificant work on the front, new wishbone bushes, drop links, returns, spheres etc. The rear and accumulator spheres are about 3 years old (25k) and still reckoned to be 'good', even though I have replacements to hand. One thing to watch for is a fastish rear 'settle' when you know the rear spheres are good. With a good rhc the 'settle' is very slow - mine stayed up for over a week after the rhc had been changed...
Doubtless someone else has encountered this problem, but I pass it on as our cars are getting older and this type of thing can happen at pretty much any time. FWIW this car has done approx 165k, about the same as my old 14 did when it too blew a rear height corrector.
