On his album Backstage (I'm Lonely). First written as an instrumental, which would have made for a second instrumental Flamingo (see the first one). So words were added, later a different title. Pitney's was the oldest version recorded.
Manfred Mann [as Pretty Flamingo; n°1 UK]
Tommy Vann [idem]
Tommy Roe [idem]
Los Mustang [as El Gran Flamingo]
Richard Anthony [as Sur notre plage]
Dino, Dezi & Billy [as Pretty Flamingo]
Rod Stewart [all as Pretty Flamingo]