Great news all round. 40,000 is pretty good for the Olympic Stadium. An England win on Sunday might give it an extra bump.
Some of the previous England/GB Internationals in London:
Wembley - 2013 World Cup Semi Final Double Header (Eng v NZ)- 67k
Wembley - 2011 Four Nations Double Header (Eng v Aus) - 42k
Loftus Road - 2005 Tri Nations (GB v NZ) - 16k
Wembley - 1997 Series (GB v Aus) - 41k
Wembley - 1994 Series (GB V Aug) - 57k