€15k. 30,f. What do i buy

Hey,

Ive €15k, max €16k to buy a car
5 year credit union loan. I will cover 100,000km through this.
Ideally reliable over the loan period.

I have 2 older kids. Not in the car with me often.

Mon-fri i travel 20km to work. 2km at lunch.
20km going home.
This is on 80kmh R roads. Completely rural no traffic lights or junctions. Just open road.
Weekend we use my husbands car generally.

Not peugeot/citroen/renault/opel/vauxhall. Have had too many issues with all these before.

Requirements
-Automatic gearbox
-B segment minimum
-Aircon(dualzone preferred)
-Passenger seat height adjustment(IMPORTANT, hard to find on japanese brands)
-Heated seats would be nice but not required

Nothing below 40mpg(uk).

Would i get away with a diesel? I go on a motorway maybe 4 times a year 🤷‍♂️ . My husbands car is 2.0 diesel octavia estate.

Dislike toyota chr… test drove one wasnt happy too dark, no passenger seat height adjustment, despite being fairly good spec otherwise.

Is there a particular year range i should go to for the best value for money?

My husband has only ever had vag, and he was always happy.