My web searches attribute this to Douglas Stephen and Panos Koulermos. Date Built, 1961.
The influence of the Unite' is pretty clear and the floor plans you can find on the net show a similar duplex arrangement with long narrow rooms, the lower single aspect, upper double although no mezzanine here as in Marseille. Another major departure is the commerical office space from ground up to 5th or 6th floor level - and the 80s addition at the side.
It's immediate neighbour, Cresta House, seems to borrow heavily from it although the plans I've been able to find from estate agents show much wider and larger apartments.