When ffolkes arrives at the railway station, it cuts to a British Rail high density suburban-type Diesel Multiple Unit arriving at the station. It then cuts back to ffolkes walking towards the train, and the train is now a cross-country type train with side corridor and compartments.
There is an inconsistency trying to maintain "radio silence". A comment is made about not using the radio so that it cannot be picked up by the hijackers. First the admiral has to write the order to blow up the rig to go on the helicopter. Then Ffokes has a teletype sent to find out if his men are on the way. Finally when Ffolkes tells the PM that she has to blow up the boat, he is using the radio. So much for radio silence.