In reply to Timmd:
All cars will cost money to run and with older cars you have to put your head in a different place from newer cars.
Every so often, you will have to spend as much as the car is worth. If done wisely then you end up with a car that will pass the next MoT and do a lot more miles before the next big billing. If you take the alternative path of just buying another banger then you are buying somebody else's problems.
If you can get hold of the emission readings from the last two MoT then there are some good indicators there for engine life. If the car has passed everything by a reasonable margin, especially HC, then it is a good sign.
All rubber parts whether wipers or bushes or tyres or hoses need replaced regularly. Hoses may start to give problems after 6 to 8 years. Original maker's suspension bushes last a long time but if replaced by cheaper stuff may fail again in 2 to 4 years.
No compromise is worth taking on timing belts (best plan is a car with chains!). A good make of belt is always worth it because the labour is the main cost.
Batteries last maybe only 4 years for aftermarket types. So after four years, you need to be suspicious of any charging problems. It can be the alternator but batteries have a far shorter life. If you ignore the elderly battery's problems then keeping it all going will also kill the alternator.
Starters and starter rings are a pain in the neck. If by any strange chance the clutch is also showing signs of age then this is the time to kill two birds with one stone. On most cars, all this can be done cheaper at the same time. New clutch kit plus secondhand flywheel and secondhand starter.
Even main dealers are usually rubbish at electronics. Check the internet for info. Consider using an experience specialist
The internet is a fantastic source of information about car repair. Almost every make of car and type of fault is covered by a website somewhere.
If your car, having survived 100,000 miles and several MoT test already without completely falling apart, keeps breaking then there are two things most likely to be causing problems. The person who is driving it and the person who is fixing it. Consider anger management training (useful in both cases!).
Post edited at 16:55