Begin with the venerable discount theatre ticket booth, TKTS, in Leicester Square (tkts.co.uk): try to arrive well before opening time (9am) to get the best choice of shows for the evening.
Cross over the Golden Jubilee pedestrian bridges. Walk along the South Bank and back over Waterloo Bridge.
Turning down the ramp on the Embankment side to the terrace of Somerset House (www.somersethouse.org.uk).
