|Model by me, figures are WWI British infantry from Peter Pig.|
It was an interwar British vehicle that mounted a pair of Vickers guns on an adapted aerial Scarff mount. I don't believe any made it into service in WWII; the Kegresse track system was thoroughly obsolete by then.
It's available for sale in 1/100 (15mm) scale at http://shpws.me/MiBM , and also in 1/72 (20mm) and 1/56 (28mm) scales.
I really need to get some crew figures to populate some of these models.