That used to be a problem with RS4 bucket seats getting stolen. Can't see them being £12k though?
No, they're weren't £12k, when I spoke to my local dealer, they quoted £13,500.
Apparently, they have to order every individual part down to nut, bolt and screw and then assemble them. Parts are £12,200. Labour is minimum 8h at £126/h but they reckoned to budget about £13,500 to be safe. As they'd never done it before.
Not making it up, I made them give me a written quote. I'll post it if anyone doubts it. Like I did!