TTTI don't know for sure either, and neither do you.
But if some of those 20,000 Police had been employed on surveillance duties, keeping a better eye on known Islam extremists, then they can't have done any harm, can they ?
And when an attack occurs, then more Police are needed, which is the situation we are in today.
Whatever way you look at it, less Police resources doesn't make sense.
Ask the people in Britain, that are trying to go about their normal day-to-day lives, whether they would prefer to see a much beefed up Police presence on our streets, or would they like to see less ? I know what I would say.