It's just a sample size of one, but I got my UK D1 from Joel at Power Stance Import out of Michigan, sight unseen, via an eBay listing (checked his profile there and he doesn't have any listings currently). What sold me was the thorough video he posted and after I had my LR tech look at it, it totally matched how it was represented. Transaction was super easy too.
Prices here in the UK are going up for Defenders because us Yanks are buying them up.
2 years ago you could get a nice Defender 110 with moderate amount of rust for 10,000-15000 quid. Now a sh!tty rust bucket is going for 20000-25000 quid.