Well, after almost a 2 week delay thanks to Royal Mail, they finally decided to deliver the new spark plugs (along with an assortment of other packages we'd assumed were nicked or lost).
Fitted them and it started on the first go.
Unfortunately, when fastening one of the coilovers back down the bolt head sheared off (happened just as it was starting to get tight) so now I've one coilover that isn't secured and a bolt I can't get back out. Will I have any problems with this (the wiring and cables above it are holding it somewhat firmly in place)?
Also, I'm still unsure on this oil issue. Now it starts and I can let the oil cycle a bit I can't get a decent reading from the beyond useless dipstick. It's over but I can't really tell how much as it varies every time I put the stick in, sometimes just slightly over the H, sometimes about 1-2cm over. At most it's going to be a litre over (what I put in before I did the plugs) but then that depends on what the oil level was at the time I garaged it. As it has to be MOT'd anyway I might just get them to do the oil change, so will I be safe driving it there? What should the oil pressure be at idle?