Churchill AVRE (Armoured Vehicle Royal Engineers) "Flying Dustbin" armed with a 290mm spigot mortar which fired a 40lb (18kg) charge up to 80 yards (72m). Its purpose was to destroy concrete.
IWM
Imperial War Museums : <a rel="nofollow" class="external free" href="https://www.iwm.org.uk/collections/item/object/205124985">https://www.iwm.org.uk/collections/item/object/205124985</a>