update:
have pulled engine block out to dis assemble. so far have found no1 cylinder big end spun, main shaft journal 1 worn.
no1 big end journal has considerable amounts of wear... unevenly so aswell. :/ not sure if conrod is out of round but am suspecting so. even though it looks good.
some pics:
pistons look alright, just a bit dirty
no1 conrod
and finally one of the big ends that hadn't spun.... still a bit sad