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[Impact Pete]

As said above somewhere, most likely cause of doors locking themselves is a faulty switch in the lock actuator.

Most likely cause of multiple things not working is a blown fuse.

I don't know if the Omega locking system will blow fuses if operated continuously (party trick with Rover SD1 was to lock/unlock quickly 3 times. On the third 'lock' the poor overloaded fuse would blow..........)

My old (1994) Omega suffered from fractured wires by the boot hinge at around 150,000 miles then again by the passenger door hinge at around 190,000. Didn't blow any fuses though, just wouldn't light up/lock until I replaced the offending wires.

right thank you that gives me something to go on rather than switching out parts that are fine, I do like to see an exact fault like a dodgy wire etc so hopefully I will find something, baby a little too young to put anything in rear socket but that does make me ask the question what if there is a faulty wire at that point? not so likely as nothing moves around there.
Regarding lock actuator I replaced the 2 micro switches last year with rs ones as it had stopped working so not sure if that would be the issue again although you dont even move the door just lift the handle and they all lock, plus while filling with petrol the car just locked itself while all doors were shut..

[Impact Pete]

Hi not having much joy with finding any damaged cables or damaged door switches, 2 new problems happening intermittantly, first doors all lock immediately after unlocking making it really hard to open a door!, 2nd I parked up for a minute and left headlights on and left indicator on , returned to car buzzer making noises and hazards were flashing inside but not outside dashboard lights were dimming in time with flashers!


 

[Marks DTM Calib]

Check 0v connections around steering column and drivers footwell

[Impact Pete]

Check 0v connections around steering column and drivers footwell

  checked the drivers switch again got a massive arc as i replaced it when ground screw made contact hazard dash lights came on relays were clicking so removed switch cleaned with wd40 replaced but now problem permanant which is good as it was too intermittant, so metered the switch again and now with plunger out there is continuity between both connectors as well as between each individual connectors and the ground 

I would now assume with this in mind this is as already pointed out is the problem, I needed a definate answer as my car too many times has faults that 'mend' themselves a few days later!