Well some progress today. The car started second turn of the key, so I checked as many hoses and gaskets as I could, sprayed some easy start around to see if it was being drawn into the engine anywhere, but all seems ok. Went to move the car onto the drive way and it cut out once, but restarted straightaway.
Fitted new ignition parts, the plug at the front of the engine was a bit wet and the other three were quite dark, maybe a bit darker than I'd like. Went fairly well apart from having to go out halfway through to get a new spark plug socket as the rubber grip had disappeared from mine. Rear plug was a bit awkward with the strut brace in the way but managed it eventually (I'm really no mechanic). Started engine, cleared all the codes, after a good drive the car seems to be running well and the codes haven't returned. I'll be interested to see what happens on the next cold start, but I'm hopeful I've at least improved things. Much as I enjoy annoying my Mrs with the stupidly loud exhaust, it can't be helping the general running so that will probably go soon.
Next job was to fit the new boot lock, this was a bit fiddly for my fat fingers but works well. After than I touched up the paint around the boot badge, and refitted the badge.
Once I'm back from holiday I need to tackle the brakes, the front left caliper is dragging and the drilled and grooved discs currently on there really have seen better days. More expense!