Sitting having lunch by the bank of the Thames, overlooking HMS Belfast and the Tower of London, I'm struck by the proximity of differences.

Walking a couple of minutes in any direction, I can find wealth and poverty, greed and hardship, history and modernity. London is such a mix of cultures and influences and it's a fascinating place to spend time. Look over my shoulder to the Shard and just a few seconds beneath it lie a busy Immigration Service reporting centre and a - sadly - busier homeless shelter.

Proximity should remind us to count our blessings. And strive to make a difference to someone. Anyone.