In Glasgow, I was in the Orange Shop, Braehead from 12-5. I got a 64GB WiFi 3G, White. The girl said there were 2 more 64GB, 2 x 16GB and 3 x 32GB left after me (I have no idea about colours, other than they definitely had at last 1 black 64GB left after me (cos I was offered black or white), and i assume they'll all be 3G ones, since it's the Orange Shop).
One woman came in about 4 and asked, when told they weren't on sale till 5 she left. I left the shop at 5:40 and she hadn't came back. As I was leaving one guy came in to buy one, no idea which size he wanted.
They will definitey sell you one full price OR subsidised/contract. The subsidised ones are the same price as last year's subsidised models, even though the full price ones are cheaper.
They had pink, grey and blue polyurethane smart covers (no idea how many, I bought the blue) and black leather one.
I would imagine they'll have some iPad 2's left today, they said they didn't get too many phone calls, they certainly weren't busy in terms of iPad 2 queries in the 5 hours I was there.
Only caveat is they were open to 9PM last night, so they may have had a rush of people who finished work at 5/6.
Hope this helps.