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Campaign records examined by The Times indicate that Sun served as Wang’s campaign manager, lending money and helping bring in donations — some of which came from sources with ties to the Chinese government.

It is understood the chancellor attended an event at the National Theatre over Christmas but did not add the donation to the MPs' register of interests within the specified timeframe.

Lisamarie Canning, from Honesty Jar, added that "without the continued support of our communities from fundraising events, donations, and volunteering, we wouldn't be able to continue the vital support we provide to those in need".

She appealed for people to register as donors, to help others with the same diagnosis, and compared stem cell donation to giving blood.

In Madrid there has been an urgent call for blood donations ahead of the big public holiday weekend.