I also get all my European discs from Amazon (either
www.amazon.fr or
www.amazon.de), you can't really go wrong with Amazon. Plus if you have an existing Amazon.com account it is valid on all Amazon sites except Japan and the ordering process is the same, so it should be easy to do even if you can't understand the language.
Regarding the UK Beauty and the Beast. Yes, It includes the opening title card for Silver Screen Partners.
Personally I think it includes a better picture quality but it could simply be because of the increased PAL resolution. I'm not a big supporter of PAL over NTSC on live action releases as I often can't tell the difference. However I do think the increased resolution and heightened colours are noticable on animated films.[*] Playing a PAL disc in a player which converts it to NTSC for viewing on an American television will, of course, negate this advantage, so I would think carefully before purchasing the disc if picture quality is the only reason you want it.
On my set up there doesn't seem to be as much MPEG artifacts - but this could just be my player handling the PAL picture better (it has lots of Digital Noise reduction, sharpness and contrast settings which I continuously tweak when I am bored!). Or ir could just be Disney used another master for the transfer which was better quality (The presence of the "Silver Screen Partners" opening card sort of supports the other master theory).
As for contents - the first disc is pretty much the same (off the top of my head I think it's missing the Sneek Peeks off the menu but 2 or 3 are still shown when the disc is inserted). As for the second disc, "The Story Behind The Story" is missing the Disney stars' introductions, but all of the actual narration seems to be on there. I can't think of any other differences.
The UK Snow White on the other hand is missing a lot of content from the American disc. The "Making Of" on the first disc is only 20 mins, half the length of the American one, the original mono soundtrack is missing and the Silly Symphony short "The Goddess Of Spring" is also missing. However it does come in a wonderful cardboard case which opens like a book, and a full pocket sized reprinting of "The Art and Animation of Show White" is included in the package (round about 200 pages on high quality glossy paper)
[*] Just to even the debate, for those more musically inclined the PAL release is of course sped-up 4%, altering the tempo and pitch of the soundtrack by a small amount.
_________________
Most of my Blu-ray collection some of my UK discs aren't on their database