Labour's shadow immigration minister said it was important to ask questions about the impact of foreign workers on the UK labour market, and address the concerns of UK residents and citizens.
He said there were questions of fairness to be asked about the hiring practises of British firms that specifically target foreign workers, and singled out Next and their association with an agency that targets Polish staff though its Polish language (only) website.
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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.