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30th July 2018
10:06pm BST

In exchange for entering a competition to win one of the bottles, entrants had to provide an email address.
Personal data has developed increasing importance for political parties, as indeed for businesses. The Conservative Party spent £2.1 million on digital advertising during the 2017 general election compared to Labour's £577,269. But for that spend the Tories enjoyed a significantly lower reach on social.Explore more on these topics:

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