fitted springs to the disco this afternoon, Britpart's finest...
OK... NRC2119 (RR/disco diesel front) look pretty good on the front of the V8 disco, it looks to be sitting about an inch higher than it was and a bit stiffer too.
HD 90 rears have achieved a similar result at the back, although they appear to be very similar to the standard disco springs that came off it. These are the RKB101230/101240 pair, which are dual-rate - the lower rate is about the same as the only figure I could find for the disco rears, the upper rate being higher. The ones that came off are alleged to be single-rate, but they seem (not measured 'em as yet) to be thinner wire for the bottom coil than the rest, which is both a) odd and b) makes them variable rate or dual-rate. Funny way of doing it, though, mostly it's done by varying the helix angle (coil pitch) using a single wire diameter.
no-one seems to have data for what these are meant to be. the free length of the (identical) pair (pink, red, red) which came off is about the same as the free length of the longer of the HD90 pair that went on. not quite the result I wanted - although it's sitting higher than it was at the back, it's still a tad low compared to the front. I may get tuits to make up a spacer to go on the axle (which should in theory be a doddle - just needs a suitable-sized ring of steel with a couple of bolt-holes) and lift it another inch or so.
quick test run up the road seems to indicate that it's handling OK, within the limits of the none-too-new standard dampers.