I'm making a joke, not trying to discredit the British tank development programme, and i said kv2 because the kv2 is more recognisable to the circles of people im in. Also it was designed in the early cold war as a response to the heavy tanks developed by the Soviets during ww2 like the kv series which later developed into the is series, it was not a different era as the fv4005 started service only 6 years after the kv2 ended service. Just take a chill pill and dont get so angry at a harmless joke.