@Mark Ingram Thanks for the reply. I've attached the log file.
It crashed twice for me this morning - but since your reply I've done all I can to make it misbehave and it's been perfect. If/when it does crash again I'll send the dump.
@krbo Thanks for the driver suggestion. I use Topaz labs (denoise, sharpen and gigapixel) pretty extensively, bith as plug-ins to Affinity Photo and as standalones. This current driver has given me no issues at all with using them. The previous one did. The fun of computers, eh? Makes me glad I'm not a programmer / in QA! Tracking down bugs must be a nightmare when experiences differ so. If I ever manage to get the crashing to be repeatable (or at least find a way of triggering it a bit more frequently than at present) then I'll try rolling back to the version you suggest.
FuzzyIan got a reaction from krbo in OpenCL Acceleration Crashes Graphics Driver (Intel UHD Graphics 620)