The book always recommends changing the sump plug washer as well but I'm not sure if everyone does that,,,
Looks like Hein Gericke are doing their oil and filter deal again, I registered on their loyalty scheme at the weekend so it looks like I'm getting their 10w 40 oil and a filter for £14.99, happy days! I'm pretty sure that their own brand oil is Motul so no problems with that.