Pooh is 1.75:1, as everything after 101 Dalmatians was supposed to have been (though this list states no info on The Sword in the Stone):
http://www.dvdizzy.com/forum/viewtopic.php?p=555729
I don't mind them framing 1.75:1 titles at 1.66:1; it's a relatively minor change, but 1.75:1 would be...