Having had a good look around before we bought this Cali (our last one was a bit of a PITA so we looked at other options to replace it) and I saw SO many complaints about more recent UK motorhomes and caravans. It seems they simply WILL leak and neighbours have an expensive Autosleeper based on a Peugeot van - no end of problems and a rubbish warranty too.
Apart from the California, a couple of German outfits do really nice looking Merc Sprinter 4x4 conversions that look great but they are £80k+!
I'm under no illusions that German quality is infallible - with our last VW being a big headache and all sorts of issues with Mercs and so on - but on the whole they seem pretty good.
But if something is well made AND British I do get a nice glow - Berghaus, my new Mybo Origin bow (a stunning piece of kit made properly using top notch machining and hand finishing) and a few other brands always get my vote. We're good at high end clothing too (as well as Berghaus) - things like wool jumpers, coats, high end tailored clothes.
But we can't make campers, caravans or cars unless the Japanese are there to hold our hands.