Hi Tim,
Actually his full name seems to be: Norman Patrick Watkins Hancock.
He did an interview for the Imperial War Museum which you can find here:
http://www.iwm.org.uk/collections/item/object/80009900
In it he mentions that there were 6 pilots patrolling.
Brian Cull gave me the other 3 names:
Peter Boot, Peter Matthews, and Bob Rutter.
They would have been in 2 groups of 3, Berry leading one of them. I have no idea who was leading the other, or how the other pilots were distributed.
Mark