Going down M5, about 90mph, strange screeching noise appeared, not loud, dbit like a screeching belt, or something rubbing a bit, seemed quite minor, changed in note with throttle position more than revs.

After a few secs car started losing power, first i thought it was the aircon as it lost power in the same way, but then kept losing power.

No knocking or rattling or nowt you could hear.

Water temp was fine, oil pressure light wasnt on.

Looked in rear view mirror and thought i could see dispersing blue (ie oil) smoke, but not sure.

Car kept losing power and slowing, got another mile till it got to sub 30mph, so pulled up and car immediatley stalled, no oil light once, till it stopped.

Popped bonnet n steam/smoke was coming from head, seemed more like smoke, and certainly smelt like burning oil.

Head was super mega hot, littlest touch gave me a blister. Finally got oil cap off and head seemed dry.

Checked oil on dipstick and was at maximum, as ever.

Water was pretty much fine too.

Head was that hot it was still too hot to touch 2 hours later.

Turning engine over sounds fine, but seems easy, so maybe no compression either.

So whats up? Its not lost oil, there no mega rattles or knocks and the oil light didnt come on, so would that be dead oil pump?
But if wasnt that, why would head be dry?

Engines totally fucked tho I guess

Spose best find a s/h one to put in. Easy engine swap?