The vacuum pump on the Disco has developed a fairly serious sort of oil leak. Did a search to find the thread on how to rebuild one and while reading the thread saw that "Robinson" had posted that later non OEM pumps had torx screws instead of rivets hoilding the top plate on.

Checked mine and what do you know T20 Torx screws. When I checked the tension on these found that 3 could be tightened at least one turn just by hand. I've tightened them all up now and hopefully this will solve the problem.

So if you get a leak from here check what is holding the top plate on before you get too carried away. I would have pulled the pump off if I hadn't read the thread.

Iain