I reset the timing last night from 0.88 to 0.98mm.
Ran fine this morning, no rattles, no smoke, until a mile from the office, when I pulled away on a hill around 3000rpm, it suddenly lost all power, started smoking lots (white/blue, smells of unburnt diesel) and sounds like a tractor.
I'm thinking (hoping) the timing has somehow slipped, but could it be something more serious, like a pump problem? It's just had a rebuilt pump with a chinese 12mm head (300 miles ago). Someone told me to keep the revs down for the first few hundred miles to "run it in" as some people have had problems with them. So, I've kept 3-3300 rev limit.
Car still starts, but sounds way too advanced, and won't idle on it's own. Can't see any signs of headgasket problems, or anything exploded/leaking.
Can't check the timing until tomorrow morning at least. What do you guys think? Video below:
https://youtu.be/eQAXlfIDs5s