Garden Bridge
Originally an idea of actor Joanna Lumley , and strongly supported by Mayor of London , Boris Johnson , Thomas Heatherwick worked with Arup on a proposal by Transport for London ( TfL ) for a new bridge across the Thames between Waterloo and Blackfriars bridges . 
<triplet> Mayor of London <subj> Transport for London <obj> organization directed by the office or position <triplet> Boris Johnson <subj> Mayor of London <obj> position held <triplet> Blackfriars <subj> Waterloo <obj> next crossing upstream