They worked together on McQueens wartime movieBlitz, which seemed appropriate for two Londoners.
Heres the full statement from McQueen:
I first met Adam Somner 12 years ago in Heathrow airport.
He approached me to say he would love to work together one day.
Adam Somner and Steve McQueenJosh Telles for Deadline
I had no idea who he was and then I found out.
He was encouraging to everybody on set.
He was a working class hero.Up until the very end we were talking about the next project.