Well, Braydons are offering Nivomats at a smidgeon under £150 per side (765) plus £10 carriage.
What are alternatives?
Volvo Mike suggests possibly REALLY heavy-duty shockers at about half that but surely that would not alter the steady-state ride height.
Are Monroe Load-levellers still available?
Has anyone used the rubber doughnuts you squeeze into the coil to stiffen the rear springs on a nivomat car to enable fitting of a non-nivomat shock?
Then there is
http://www.mad-suspension.co.uk/home.htm who do the inflatable inserts - but I know not of their prices.
Suggestions, O learned ones?