Thanks for the welcome guys.😀
I bought the car from what turned out to be a shady con dealership, noticed blue genies three days after driving away, got fobbed off, they refused to honour the warranty they provided or even take a look at it. Ended up taking them to court, they treated it as a joke and ignored the whole case so my CCJ against them ended up set in stone.
But they've emptied their building and done a runner so now after all that and after I pay the bill to court enforcement as they've given up, I'm going to have to fix it myself.
I (and my mechanic family & friends) suspect valve stem seals and possibly guides, but there's a leak on the back of the engine somewhere so while it's out I'm just gonna overhaul it. Obviously the cheaper I can get the parts the sooner I can get her back on the road.