Hi rory kim.
If you look at the rover SD1 water pump then if its similar. You will probably have to cut the nose off it to fit the +8. This is what I did with my spare water pump, although it was a tough job to hacksaw it through as the centre seemed to be hardened steel. The original pump I removed and it was reconditioned with a new seal and bearings. This was done in Hamilton New Zealand so not much good to you. There must be somebody in the UK who reconditions the pumps
Doug from deep deep downunder.