From the release:
Amongst the most distinctive-looking tank designs of World War II, the A11 Matilda I was the first of the British infantry tanks. Not to be confused with it’s namesake, the A12 Matilda II, which replaced it’s predecessor as the war progressed and armoured technology also moved forwards. The two tanks were very different in design and shared only the name and the role of infantry support vehicles, sacrificing speed for greater protection.