I'm a driving instructor - what should I get to replace by four-year-old Fiesta?

Can you recommend a car to replace my 2015 Fiesta 1.5 TDCi Econetic? I'm a driving instructor covering 55k miles a year so needs to be a diesel. My current fiesta is on 162,000 miles and never had any...

Are driving instructors insured for any damage caused by the people they're teaching?

My 17 year old son hit a kerb during his driving lesson and the instructor is saying we must pay £70 for a new tyre. He has also mentioned losing booked lessons at some cost later, though I know he fitted...