London Mayor Boris Johnson left a pre-recorded message for Nick Clegg's LBC 97.3 radio phone-in to ask "when are you going to get all those Government ministers out of their posh limos and onto public transport".
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The showers will be most frequent in the north and west of the country.
Almost 200 people were wounded after an explosion ripped through a venue in the western part of the city.
It comes as Labour leader Jeremy Corbyn reiterated his call for MPs to work together to prevent a no-deal withdrawal from the EU.