Police Federation Chairman Paul McKeever will tell Theresa May today:
"Home Secretary, we warned you about the riots and you said we were scaremongering.
"We warned you that a 20% budget cut would damage the front line and were told we were wrong.
"We are warning you that you are racing towards a train crash that could destroy the effectiveness of policing in this country and harm the safety of the public.
"Home Secretary - take breath. Stop now, and review what you’re doing or you will be found guilty of destroying the finest police service in the world."