Exclusive: Sources say Labour whips are calling MPs urging them to heed union’s warning and not vote for cap

One of Britain’s biggest trade unions has told Labour MPs not to vote for a cap on political donations next week, warning it could endanger union funding for the party.

The GMB union has written to its affiliated MPs urging them not to vote for amendments to the representation of the people bill that would cap donations at either £100,000 or £1m.

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