Costs Lots
Tanks are very expensive to purchase, maintain and operate. The Challengers are at least 30 years old technology and for some reason they are never in the right place. The next big battle/war is going to be fought where???? So the next MBT design needs to be capable of what??? Using what technology????? The lead time between concept to ready for action is 10 years+ minimum.
Easier to win the lottery yet the MOD is expected get it right :-)
Biting the hand that feeds IT
