I used morris oils, think it was £24 for 5 ltrs. Its been a while but I recall if you remove a bolt from the right hand side of the nearside gearbox vertical heat shield it will flex out of the way enough to give much better access to the sump bolts.
That bolt has a lot of unnecessary exposed thread which had gone cruddy making removal a bit tougher than normal, I replaced it with a shorter ss one.
I've heard talk of a magnet in the sump but there wasn't one in mine.
I also found that the britpart filter kit sump gasket didn't fit as nice as the original, but it did the job, and one of the copper washers was incorrect for either the drain or fill plugs, I forget which, so chuck nowt away until the job is done.
Pretty sure it was the fill plug washer that was wrong.
You will only get 4 to 5 ltrs of oil out , I did two changes around 100 miles apart, some say 3 changes for belt and braces. Follow RAVE for correct fill level procedure.