Meet: London Bridge Station (street level, near the tube exit onto Duke Street Hill where it forks off Tooley Street, by the now pedestrianised Joiner Street, underneath the blue plaque), at 18.30 hours.
Walk part of the route linked below (maybe slightly adapted on the day to route through some of the green spaces en route), with the aim of arriving in good time at Two Temple Place for a visit of this exhibition ( the free exhibition is only on to 21 April and only open late on Wednesdays ):