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The home secretary at the time, Suella Braverman, who appeared in the video, called his criticism "offensive" and "lazy", while Downing Street said it was "not acceptable".

I recently attended Downing Street to present a petition to the government to end the postcode lottery for gluten-free prescriptions in my role as an ambassador for the charity Coeliac UK.

The prime minister stressed his commitment to "free and open trade and the importance of protecting the national interest", a Downing Street spokesperson said.

The trust's Living Legends petition, which aims to secure such status for heritage trees, and which attracted more than 100,000 signatures, was handed in to Downing Street in November.

Downing Street defended the principle of parliamentary privilege following the court's ruling.