Thanks guys for the replies. The Haldex service was done at 21000 and spark plugs at the same time (so 10000 miles ago). It's had 5 oil changes in total since new, plus all the filters, inspections etc at the right times so seems to have been properly cared for. I think in my own mind I'd already decided that I wanted to do the DSG oil change as that was the only thing I could see that hasn't been done and you've helped make my mind up. Anyone recommend a specialist in Nottingham 🙂