Today, inner-city churches are usually hemmed in by shops, as though they were branches of CofE Boutiques or something. But they originally had their own churchyards, which were gradually built over as congregations moved out to the suburbs and the centre was taken over by commerce.
The church as it appears today is mainly 14th century, with flint walls and a typical pointed west window with flowing tracery. The curved leaf-shapes in the tracery are called foils, so the circle in the top of the main window is a quatrefoil and the triangular blank window above is a trefoil. The pointy bits between the foils are cusps.
But why St Olave? He is the patron saint of