Hi Guys
Barring the glow plugs, what are the usual service items needed for a Ducato X250?

I'd not change the glow plugs unless they're giving trouble, they're not like spark plugs that you'd change every service.
Your service record book should say what to change when but if I bought anything with no history I'd do the following.

Oil & oil filter
Air filter
Fuel filter
Pollen filter (if fitted)
Check all tyres & check all levels.
Check operation of all lights.

You should also consider
Check antifreeze & drain, flush, refill if in doubt.
Check the 'fan' belt, change if it looks shabby & keep old one with the van for emergency.
Check brake pads / shoes for wear.
Cam-Belt?? If its got one when was it last changed?? If in doubt get it done!
Hope this helps
Gareth

As above,
I and others change gear oil too on a regular basis, it's not a service item, as gear oil is a "lifetime" oil, but wear/bits of metal can cause breakages, I change mine each year,
Also when checking rear brakes, check handbrake cables,
Common to seize up solid.

If you can, use Selina (fiats recommended) oil, it is bloody good stuff, and outlasts service intervals.
If not, make sure the spec is same or higher,

rolopolo said:

As above,
I and others change gear oil too on a regular basis, it's not a service item, as gear oil is a "lifetime" oil, but wear/bits of metal can cause breakages, I change mine each year,
Also when checking rear brakes, check handbrake cables,
Common to seize up solid.

If you can, use Selina (fiats recommended) oil, it is bloody good stuff, and outlasts service intervals.
If not, make sure the spec is same or higher,

Click to expand...

If I have drum rear brakes I normally wip the drums off, if there's a lip on the back edge grind it off then click up the self adjuster until the drum just fits.
Gives a better pedal feel & fewer clicks on the hand brake.

how much approx. should it cost to change cam belt?

Without seeing what's involved I can't be sure, my old 2.5D would have taken about 2 hours I'm guessing, maybe a more modern one 4 hours. @ £50(??)an hour + the belt & any other bits.
I'd not be surprised at £300.

My guess is that it is much more expensive. The workshop manual presents a long procedure list, starting with the removal of a wheel, wheel arch liner, head lamp unit, bottom shield, coolant tank, servo fluid tank, A/C compressor belt and multi-V belt. Only then can the timing belt cover be removed and the actual job started.
I should have had the belt replaced years ago, contemplated doing it myself, but the long list and the special tools needed kept me from doing it.