Last month 16 people were arrested on accusations of planning or attempting to travel to the Syria or returning from its battlefields and training camps.
The soaring arrest figures - which compare with just 24 Syria-related terror arrests in 2013 - are evidence of an increased focus on the terror threat posed by a number of young Britons gaining paramilitary training and battlefield experience overseas.
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In a tweet on Saturday, the US president didn't give a reason for his absence but said he wished"everyone well and have a great evening".
Weather conditions remain wet and windy through the weekend.
Mr Banks has given Ukip leader Paul Nuttall an "ultimatum", saying if he is not made chairman he will stop supporting the party.