The Plaza was between Kingsland Road and Carlton Road - The photo that is shown here I must admit I can't remember it like this but Chris worked there in the 50s.
I think this photo is before Borough road was widened.
Looking from the direction of the shot to the right would have Bloyds Building yard and to the left would have been a furntiure shop, armed forces recruitment center, and the famous Kingsland Cabaret / Restaurant on the corner.
Opposite would have been the Top Twenty Cafe, Grimshaws the newsagent, and my school pals Mum & Dads corner shop that sold everything. Also would have been Bensons the general DIY shop which eventually became Turleys Pub