Odd juxtaposition - a millennium separates these two works. That's a 10th-century Saxon rood (St Dunstan's is one of the oldest established churches in London) in the lower part of the pic.
The stained glass above it is postwar, of course - the left panel depicts the ruination of Stepney, the worst hit borough in London in the Blitz. The gasometers in the background survived the war but have gone now.
Like most churches in London, St Dunstan's lost its original stained glass in the war, but thankfully the main church fabric suffered little damage.