I've not had the best 7/8 months with cars. Early this year I had to pay a tonne of money to get my BMW 320cd serviced (120,000 miles), and it had a big list of advisories, including the glow plugs ...

Timing chain. But lots of reported problems with the N47 engine and its chain. If the car has made it to this age then it's probably fine (most issues occurred in the first few years of ownership).

You should have the B47 engine fitted to your car (which replaced the notorious N47 which had all the problems with the chain). We would check to see what engine you have fitted as if you have the N47 ...