I collect Whitefriars Ruby, and this looks a very nice piece of glass, but I think if it was Whitefriars it would be 'Wave-ribbed', as you noticed at Cambridge, Christine. It's possible it
is WF - there are some items not shown in the catalogues we currently have, from the 1940's for example - but I can't tell you for definite, and I don't think you'll find it in the WF catalogues on the .org or .com sites. Sorry