Taking the Central Line eastwards, out past Stratford where there appears to be some kind of big sports day going on, to Wanstead.
Not many clocks today, but the first is at Wanstead station, a design common across the Underground network. This one is in the small booking hall area, above the escalators.
South of the station, in Overton Drive, is the church of St Mary the Virgin.
The current building dates from 1790.
Turning back northwards, and on to Wanstead High Street, where we find this clock on the offices of Churchill Estates.
Unfortunately this is a somewhat worn-looking clock, and one that is no longer working.
At the top end of the High Street is Snaresbrook station on another branch of the Central Line. Dashing to catch a train back to the city centre I just had time to take this picture of the clock on the down platform.
And finally, nothing to do with clocks (except perhaps in a much wider astrological sense) is the reason for my visit to Wanstead. This is Sacrilege 2012 by Jeremy Deller on its tour round the country. An inflatable Stonehenge - totally bonkers, totally British, and totally brilliant!