Watt's it all about?

In a small garden, Postman's Park, near the Museum of London, there's a wall of plaques commemorating heroic feats by members of the public, which resulted in their deaths.
The Memorial to Heroic Self Sacrifice was conceived and undertaken by the Victorian artist George Frederick Watts (1817-1904).
Some recent history books lament that the idea did not run after Watt's death, but there is one - pictured here - that commemorates 30-year-old Leigh Pitt who drowned in 2007 while saving a boy.