Thanks for the info lads, PAVEL just for clarity here's the text of the article I'm talking about. This is the motoring correspondents response;
" The Series II Range Rover ( 1994-2001 ) came in a 4 litre and 4.6 litre version. There is a known problem with the larger engine. Some are prone to developing a porous cylinder block. The problem normally becomes apparent through a huge appeite for coolant but without any of the usual head gasket symptoms, typically at the 50,000 mile mark"
Any way if the Disco I is okay I'll sleep better tonight, may be I should kick this up to the Range Rover Forum and give those rich kids up there that sinking feeling!