I discovered about Hoxton Books by reading about it online. It would be hard to find out about it any other way as it is nearly invisible on East Road, just up from Old Street roundabout – a tiny space, but impressively well stocked, including a surprisingly extensive selection of recent books about museums:-

Next door is an equally tiny, but equally thoughtful exhibition space, currently devoted to clothes which have been reconstructed from a 1930s fashion magazine. They are surprisingly contemporary – a utilitarian aesthetic, made by a contemporary Chinese designer under the label seventyfive: an exhibition both beautifully presented and informative, but only on for a week:-