© Licensed to London News Pictures. 17/03/2012. London, UK. Crews jostle for staring positions. Crews participate in the rain today,  Saturday 17th March, in The Head of the River Race which is rowed annually in March from Mortlake to Putney on the River Thames in London.  Over 400 crews of eights take part, making it one of the highest participation events in London.. Photo credit : Stephen SImpson/LNP