Geograph - photograph every grid square

Over the last few years I've done a lot of work on Wikipedia on the 16 Cantabularian Colleges founded before 1596, so I wanted to see as many of them as I could in the time it would take my mother and sister to go round the latest exhibition at the Fitzwilliam. When eventually they had finished they rang. "Where are you?" they asked.
I looked up. "Downing Street."
"Crikey, you've walked a long way!"
(Fun fact: there are 19 Downing Streets in the UK)

Fen Causeway is a link road in the city of Cambridge, constructed in the mid-1920s to ease the pressure on Silver Street. It forms part of the ring road. It links Newnham Road and Trumpington Road and spans the River Cam with Sheep's Green to the south and Coe Fen to the north. There is little residential development on this road.