The Mark VIB was produced in larger numbers than any other version of the tank, and was the version that saw most combat during the Second World War. It was very similar to the Mark VIA, but reverted to the circular cupola of the Mark VI, although with the two glass block lookouts of the Mark VIA. The number of armoured cooling louvres over the radiator was reduced from two to one. During 1940 six Mark VIBs were given rear idler wheels, as used on the earlier Mark II and Mark III. Tests with the 1st Armoured Division in France showed that this greatly improved the cross-country performance and smoothness of the ride, but a few months later the German campaign in the west proved that the light tank was no longer of any real use, and this modification was never adopted. The Mark VIB was also produced in an India pattern, without the cupola but with a periscope for the commander.

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