I really like this cover I just received from AnthonyUK.
(By the way Anthony, thanks, got the stamps, email soon being sent.)
It is a silhouette of the Thames river waterfront in London, England.
The stamp is a Machin type 2 font Faststamp (first I've had) with a
'Mount Pleasant / 8:15 PM / 19 NOV / 2010 / V
' machined postmark.
The Royal Mail, London EC logo center top makes me think either that this is a company envelope or an envelope you can buy over the counter at a Post Office.
I might make some envelopes of Halifax now. Not as many well-known landmarks as London but maybe I can add in a couple interesting ones here and there.