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Yep, already tried that one. Following the rdb fault chart it indicates control box next. Just looking best way to test / ignition is working, other than pull it out when hot to see if it's sparking but not sure I fancy that if there's a better way.

Ah, apologies I should of mentioned I changed the solenoid already. There is a sound after purge occurs which I assumed to be the solenoid being activated. There is a separate click when the burner successfully ignites which I don't hear on a hot restart failure.

My oil boiler will happily start from cold but not from hot. I believe the boiler stat stops the burner then a short period later restarts it. It's the restart that fails, press the lockout button and it won't start. Leave it to cool off a bit, press the burner lockout button and it fires up...