The Beaverette was a rush design, completed in only four days in 1940 when there was a real and credible fear of a Nazi invasion of Great Britain. This is the Beaverette Mk.III, used by the RAF for airfield defence, and called by them the Beaverbug. It's armed with a pair of Vickers "K" guns, but some later ones had the gun turret from the Boulton-Paul Defiant mounted in place of the production turret.
It's available, as usual, from Shapeways at http://shpws.me/LMlV.