Rupert Lowe, the MP for Great Yarmouth, will not face criminal charges in relation to an allegation of threats, the Crown Prosecution Service has said.

Lowe was elected as a Reform UK MP in last year’s general election but was suspended by the party in March, amid claims of threats towards the party’s chairman.

Malcolm McHaffie, head of the CPS, said it made the decision not to press charges “following a thorough and detailed review of the evidence”.

“Having considered a number of witness statements, we have concluded that there is insufficient evidence to provide a realistic prospect of conviction,” he said.

In a statement on X, Lowe said the Metropolitan Police were dropping their investigation into “false allegations” and accused Reform of carrying out a “brutal smear campaign”.

“For the sin of asking legitimate questions about the party’s direction, policies and leadership, I was vilified and targeted,” he said.

Lowe, who now sits as an independent MP, also fiercely attacked his former party’s leader Nigel Farage, calling him a “a coward and a viper”.

Although the CPS statement does not name Lowe, the case relates to an incident at the Palace of Westminster in December 2024.

Mr McHaffie said: “The Crown Prosecution Service’s function is not to decide whether a person is guilty of a criminal offence, but to make fair, independent, and objective assessments about whether it is appropriate to present charges for a criminal court to consider.

“Based on the careful consideration of this evidence, we have decided that our legal test for a criminal prosecution has not been met.

“The decision is also subject to the Victim’s Right to Review (VRR) scheme which provides a victim or their families in some classes of case with a specifically designed process to exercise the right to review certain CPS decisions not to start a prosecution or to stop a prosecution.”