"All police forces charged with controlling traffic should be trained to the standards set by the Home Office and the Association of Chief Police Officers and the role of Mersey Tunnels Police now needs to be examined, " she said, adding she had written to the Home Office to express her concerns.

BBC: Tunnel crash deaths 'unlawful'

Mr Passmore, who is now responsible for controlling budgets and setting police priorities, said the sale had been agreed before he came into office last month.

BBC: Suffolk Police loss from land sale 'unacceptable'