Andrew Rosindell has been chair of the Crown Dependencies and British Overseas Territories All-Party Parliamentary Group for several years and frequently raises Channel Islands issues in and outside Parliament.
Mr Rosindell had been a Conservative MP since 2001 until his defection.
In a statement issued on social media, he said he felt that the Conservative Party was ‘irreparably bound to the mistakes of previous governments and unwilling to take meaningful accountability for the poor decisions made over so many issues’.
He added that ‘the views and concerns of constituents such as mine in Romford have been consistently ignored for far too long’.
‘Our country has endured a generation of managed decline. Radical action is now required to reverse the damaging decisions of the past and to forge a new course for Britain – one that firmly places the interests of the British people first.’
The former shadow foreign minister becomes Reform’s seventh MP, and follows two other high-profile defections from the Conservatives.
Reform UK leader Nigel Farage has called Mr Rosindell, who has visited Guernsey on several occasions, ‘a great patriot and a great addition to our team’.
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