This beautiful clip is from the Cucumber Castle TV movie, 1969. The song, included on New Routes, is penned by the brothers Gibb, aka The Bee Gees. Lulu was married to Maurice Gibb at that time and also joined him in the film.
Another video of Lulu from about the same time, singing 'Oh Me Oh My (I'm a Fool for You Baby)', which was released as a single in 1969. This was probably filmed nearby the Chelsea Embankment, London.