The fan issue is common, the rear parking sensors need a new sensor, the aircon probably needs a regas (at a cost of £0 if you go to Kwik Fit and it still doesn't work) and the locking issue probably isn't that griefy either.
Sounds like an enjoyable Sunday afternoon list of DIY jobs to me
I've had many enjoyable Sunday afternoons under the bonnet of this car, nothing major, but enough to enjoy the tinkering. I replaced the non-clicking PDC sensor last weekend but the problem persists, I've just not had time to look into it any further, it'll be done before it gets sold I'd say.
As a buyer the door locking would drive me nuts and the engine fan not working would make me walk away.
If the fan was not an issue and the price competitive I would buy a car with these faults if the price was competitive and the overall condition of the car good.
I think, looking on eBay, a fan wont set me back and certainly will offset the value in sale price. It's MOT is due in a few months, so perhaps I'll wait as I quite agree with you, I'd not buy an old car without a good period before MOT.
So, fix the fan and sell it for what it's worth. It's in good condition, 136,000 mostly motorway miles, plenty of stone chips but aside of the bonnet, the paint is in lovely condition and still really shines. Interior is a bit average, but what can you expect from an old car!
Thanks for the help all, OCUK forum never disappoints!