Aylesbury have orange legs/feet with paler bills, like this bird. However, they are usually much fuller and more horizontal in carrige. Bill looks too pale and long to be a Pekin.
What about those rare white layer ducks that they were slipping into orders from Holderread as packing peanuts this year? Probably an unlikely answer, but I remember them having lighter beaks/feet and a skinnier build? Wish I could remember what they were called.