OK, a helpful comment.

The most important thing is an annual oil & filter change if you want the engine to keep going. Everything else is preventative or safety related. Giving the car an annual once over will identify things that may fail and leave you either stranded or, more importantly, in hospital (or mortuary) i.e. brakes, steering & tyres. An MoT is not a substitute for a service.

I think thats the least on his/her mind. Running it into the ground. A snapped cambelt will see to that!

Perhaps the OP could tell us what the game plan is?

"keeping it going as long as possible" and "running it into the ground" aren't the same thing. The first requires a reasonable level of servicing, whilst the second could mean do absolutely nothing and see what happens. To my mind, bangernomics requires a bit of essential servicing with the use of cheap/second hand parts as required, as the aim is to get cheap motoring. Cheap doesn't necessarily mean finding a replacement every six months because you ignore very basic servicing.

Check the cam belt for cracks, broken or missing teeth and so on..change it if looks as though it hasn't been changed since new. The Zetec engines are fairly bullet proof if looked after so at 70K it will have loads of life left in it yet.

You cannot decide not to change a cam belt based on a visual inspection. A cam belt can look perfect and still break due to age. In fact by the time time you had spotted any damage it would be too late anyway most likely. However you are right that the Zetec engines are no nonsense engines with good longevity as long as they haven't been run low on oil, even if this oil is old.