I am going to attempt to do a mini service on the omega tomorrow. All though it was done at 65K (now got 68k) it was back in 2009 so needs to be done really. Apart from the oil/filter change, airfilter and pollen filter is there anything else I should do while I am at it? Fuel filter has been done.
Yep, make a point of cleaning the breather system!

From recent, bitter experience, I second Lizzie's point. The breathers will get blocked - they all do - and that will blow your cam cover gaskets and eventually your HT system.

Unblocking the breathers (guide in the maintenance section) involves squirting carb cleaner and
shi foreign matter into the oil, so do the oil change afterwards.
As for the rest, this is what I am working to, gleaned from OOF, Vx service book and Arthur's manual (V6 petrol - others probably different):
5000 / 6m
Engine oil and filter
10000 / 1y
Check lights, brakes, aux belt, hoses, exhaust, suspension and steering (including tyre wear, esp inside edge )
General poke around for leaks, worn or broken stuff, or anything suspect
Steering & suspension geometry check
20000 / 2y
Clean out crankcase breathers
New air and pollen filters
Check ATF level, handbrake shoes, driveshaft gaiter
40000 / 4y
New timing belt & tensionner kit, aux belt and water pump
New plugs, fuel filter, brake fluid and coolant
70000
New ATF and filter
Empty ash trays