WATCH: Tim Montgomerie says migration figures prompted Reform UK defection

Tim Montgomerie, founder of Conservative Home and former adviser to Boris Johnson, has defected to Reform UK after 33 years as a Conservative Party member.

The prominent Conservative figure was pictured with Reform leader Nigel Farage and chairman Zia Yusuf as the party announced his switch on social media.

Montgomerie, who also co-founded the Centre for Social Justice, has revealed his decision was triggered by last week's record immigration figures.

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