There was a top end rattle (obviously due to oil pressure loss when the shell spun i guess), i limped it home with that, on the way (only about 2 miles) it developed a knock so i decided it was time to pull it apart.

Its spun a big end, havent had a chance to look at the mains yet as it was outside and started pissing it down before i got a chance to pull those off.

Crank is visibly scored though, so not going to make any difference if its spun a main or not now as if im rebuilding it then i will line bore it anyway so couldnt care less if the mains have spun too.

Shame, have been really enjoying driving it lately as well

Doesnt look like there is any reason for the failure other than just using an old engine hard, all looks worn out rather than any dramatic reason for the failure.