War is unaffordable

If it costs £14 Billion to develop a tank which won’t go faster than 20 mph, can’t fire its gun on the move and shakes the crew about so much that they have to stop and rest every 90 minutes, is there enough cash in the known universe to let our MoD develop a tank that works?
    No danger of any of the useless pillocks getting the sack, of course.