Looking closely at your photo, the phone number appears to be 020-8788 4388 which matches https://www.preto.co.uk/restaurant/putney. But also look at the logo on the windows in that photo -- they match those on the preto site. I'd guess it was once a Waitrose and being converted to Preto at that time the photo was taken, but the signage had not yet been changed. Or possibly the other way round, but the web site is offering to take table bookings tonight, implying it's currently open as Preto not as Waitrose.