Hopefully Theresa May is not superstitious because the omens haven't been good ahead of her first meeting with Donald Trump.

The UK Prime Minister has spent the past two days batting away questions about a serious malfunction during the testing of the Trident nuclear deterrent after a missile was launched from a British submarine off the Florida coast in June. It was reported over the weekend that the unarmed Trident II D5 missile had to be detonated as part of an "automatic self-destruct sequence" after it veered off course towards continental North America.