just looked on autodata and cam chain is an engine out job with over 7 hours book time and it isn't listed in the service schedule, so that's not happening

i've ordered a time-sert spark plug kit from ebay US. specifically designed for it, so will give it a go - if i can ever get the glued in one out! will just use grease and a hoover to collect the swarf and i have an endoscope that i can use to check i've got it all