The Prime Minister is hosting a PM Direct event at the factory of a defence contractor in Glasgow.
He opened by praising the "incredible periscope" aboard HMS Victorious - the nuclear submarine he visited earlier - which was manufactured by the firm that is hosting his talk.
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Seasonal rains have battered the country since late June with more than 150,000 people affected by floods and landslides.
The bus reportedly hit a tree near Russell Square.
Low pressure will throw cloud and few showers across the UK today, but it will also draw in very warm air from Europe again.