I would have difficulty in getting a locking kit over here, see its a bit of a problem even finding basic parts when you only speak basic language, anyway I went to a local garage today and asked for a quote for the work and the mechanic came out with the parts manager and it was like a classic from a movie, very funny, there was much shouting and waving of arms and very worried faces. They said they couldn't tell me how much but they would give me a quote for the parts alone. I will be going to the local Omega dealership tomorrow and asking them to check over the car and quote for the engine work that needs doing, so far what I have found out today,
No coolant left in reservoir

get real hot driving up a mountain to where I live!!!
Flat battery, charging over night to see if knackered.
All disks and pads need replacing.
All filters and fluids need replacing, and putting back whats not there in the case of the coolant, Read the how to on flushing etc, on this, cheers.
Split breather hose
Broken glove box handle.
Broken ash tray, I don't smoke, but it hanging out and not closing reminds me of when I did.
So not too bad really, mostly wear and tear and neglect

That' what I have discovered so far, anyway I am pretty sure the injectors need work,
and I will do the diesel tank work as shown on here and post some pics with what I find, expecting lots of sludge
Oh yes, it is ticking over about 600rpm and lots of vibration, like an old bus, when I increase revs to about 900, it is sweet like sewing machine, think this is still pointing to fuel starvation or air filter, or both, will know more tomorrow.
Let you know what Opel say too, should be a laugh, main dealer prices

PS: Could anyone recommend any suppliers for the performance chips, have you had good experiences, reliability etc, many thanks, all the best.