Southport riots review finds police have not kept up with social media risks / MPs issue bombshell warning over Southport probe as key law changes urged / Prevent boss leaves role after Southport failings / Prevent boss steps down after failure to stop Southport killer before attack / Southport attack parents share Andrew Tate fears / 'Gap in law' meant Southport killer could not be arrested before horror attack / Google accused of 'monetising' website linked to Southport misinformation / Authorities released inadequate information after Southport attack, review says / Girl stabbed in back during Southport attack hits out at 'false information' / Southport attack dance teacher Leanne Lucas recalls desperate attempt to save children in first TV interview