It is still largely hidden underneath white paint but what appeared so far looks very colourful. Yet not enough can be seen to identify which business was advertised there, although my guess is it would have been the store next door (nowadays the one with the black fascia and blue lettering). It is very tempting to go back and peel that paint off!
After a closer look, it appears there were two signs painted on this wall: one on a red background, which was then covered by one on a yellow background.
Location: Lillie Road / Pictures taken in July 2012