Mate you cannot deny that ON AVERAGE they are very reliable. That doesn’t mean that every single one will be perfectly trouble free.
If you truly understood statistics, you wouldn’t use the word average, as it is almost always totally misrepresentative of the population that that is being observed by the statistics! 😉
Anyway, £6k on a car… You’ve had a bad experience with a Diesel Focus, fair enough. Get out there and try a few more cars… I’d be inclined to look at diesel Skoda Octavias (same platform as Golf), possibly the Leon (if you can look past it’s interior), maybe even go for something like a slightly older BMW 3 series touring. Of the Japanese cars you mention, none will set your world on fire, Honda (still) looks wackiest, but is actually pretty sensible and has a particularly good diesel engine, the Toyota will be pretty dull but again good diesel engines in particular and mega reliable, the Mazda is just a rebadged Ford Focus. So if you didn’t like the Focus…
How many miles a year do you do?