Hi,I have a 2007 XK and have been told the sump gasket is leaking is this an easy job to do at home or is it more involved and needs a garage to sort it.

Many thanks. 

It shouldn't be a major issue if the sump has enough space to clear the subframe.
I would personally try nipping up the sump bolts first to see if that cures the leak.
Be sure to only nip the bolts and not tighten them too firmly....best use a torque wrench to tighten them correctly (as far as I can determine 12lbs is around 15nm which should be more than tight enough)

The sump is an easy fix, just remove the under tray and it comes off with no problem £30 for a gasket delivered next day all done.

The torque setting is 12Nm/9lb.ft