Well, recently got Disco 2 Td5 back from the L/R mechanic - had to get towed there as it broke down on the highway when my wife was driving. Anyway, looks like the top hose (with brass bleed) and the bypass hose just went! Two new hoses and new OAT coolant. Bit annoyed because I was just about (had already purchased the OAT concentrate) to check hoses, drain, flush and refill with OAT! Damn!
Good thing is no damage to engine - all good - not cooked - kudos to my wife for pulling over at first signs of a developing issue! Have heard so many horror stories of people who just keep going and cook their engine!