I’m certainly no expert – but replying anyway – trying to make this forum more of a thing…
Sounds like head gaskets to me – have you ever taken it to JC British? I took the Disco there last week, not cheap, but I got a pretty good feeling about the place and the people – and a bit less expensive than the dealer. They also seem to have genuine interest in working on older trucks, vs feeling like they’d rather be doing oil changes on Evoques….