Wrong pub, Cambridge is a good couple of hours away (the other side of London) and has no blackboard
You're thinking of the White Hart at Brasted.
http://www.whitehartbrasted.co.uk/home/Sadly it has now been refurbished and has, apparently, lost all of its wartime ambience and memorabilia.
http://www.beerintheevening.com/pubs/s/ ... rt/BrastedYou should visit the Biggin Hill Heritage Hangar, who have up to 10 Spitfires either flying or under rebuild
http://bigginhillheritagehangar.co.uk/On the airfield, there is also Shipping and Airlines who operate a number of pre-war classics such as a Rearwin Sportster, Travel Air and Civilian Coupe, plus there are also a couple of Proctors and a Vega Gull based on the field, and a PBY under maintenance in one of the hangars.
There's also the RAF Chapel of Remembrance
http://www.bbm.org.uk/BHchapel.htm