when mine went it was because there was little to no oil left in the block. had an oil leek that i didn't notice then a week later I heard the dreaded noise of everything giving in.
Drove it to a mates garage (not the best idea) to get him to rebuild it but half way there the engine blow and I was faced with a hole the size of my fist in the side of the block and the embarasment of being sutck on the side of the A19 with smoke pissing from the bonnet.
Supposible these engines are just about bullet proof if looked after. I made my mistake, never again i check the oil everytime i drive it now.