Did the oil and filter change that I would have done previously had I realised I needed the crush washer sooner!
There was one more small glitch, I didn't realise until I started that the oil filter removal tool took a 3/8" fitting, but the socket set and torque wrench I have are both 1/2" fittings, so I had to go to a local shop and pay an exhorbitant amount (£7.15!) for an adapter
Still, once I'd done that it went pretty smoothly