You said it in a nice way........
We already have the standard English tank.... It's called the M4....... Our FireFly, or the other two variants the Brits had. Over 17,000 of them in fact.
There is a reason they stopped making their own!
(Yes, a small smack to the Brits, but done with humor in mind)
Plenty of Brit tanks. Most dismal for sure, but they
were taking notes. Comet is nothing laugh at. And Centurion (a post-war tank) was a class-act all around.
A bit off-topic, but it's interesting to note the post-war lessons learned by England and Germany concerning tank design. During the war, English tanks (add the Sherman in there) tended to be lighter and more mobile, but more vulnerable. German tanks on the other hand, became increasingly more massive with huge forepower, but at a big cost in mobility. Apparently, both countries appreciated the benefits of the other's designs, so that by the 60's they both produced new MBTs who's design philosophies were completely opposite to their WW II thinking.
The Brits produced Chieftain, a massive brute of a tank, where survivability and firepower were definitely given priority over mobility.
The Germans, on the the other hand, created Leopard, a tank with good firepower, but
excellent mobility.