The Ministry of Defence (MoD) has confirmed it paused trials of its new £3.47 billion fleet of army tanks over design issues which reportedly include them being unable to travel safely faster than 20 miles per hour. The Daily Telegraph says problems with the new Ajax armoured fighting vehicles—which are supposed to be able to go up to 40 mph—also include an inability to fire cannons on the move. Citing a Government report, the paper said the speed restrictions had been caused by excessive vibrations in the tanks, and that crews were limited to 90 minutes inside them at a time. Due to be published next month, the report says the tanks cannot reverse over obstacles more than 20 centimetres high, that personnel must wear noise-cancelling headphones when operating them and undergo ear tests afterwards, and that the Household Cavalry Regiment “cannot conduct effective collective training” in them. The MoD …