By Ben Griffiths Manchester Arena bombing victim Martyn Hett has inspired a proposed law to protect entertainment venues from terrorists. The tough new rules are set to be recommended in a government report after a campaign by his mum Figen Murray, who said it would be “a victory for his legacy” and that action is needed “now before it is too late”. The news comes days after the concert massacre in Moscow which left 137 dead. The Home Office document is expected to lay out measures such as venue staff needing counter-terror training, bosses carrying out stringent risk analysis inside and outsi…