Have a friend with a 2012 Focus diesel, very economical but they are known for water leaks in the luggage bay, spare tyre tray often a swimming pool & in the case of his example 6th gear won't stay engaged; nobody wants to tackle a repair & a replacement 'box + labour is more than the car is worth.Get a corsa or a focus 10-15 years old from someone who looked after it.
Bulletproof cars and super cheap to service, maintain and fix.
I've always had vags, but because of the emperor's tax I found myself buying the cheapest car on gumtree with 12 months mot.
Got a 2006 focus, still haven't spent a penny in it and it's passed mot with flying colours.