Min visibility in most parts of the world outside controlled space for helicopters is if you can see enough to stop before you hit it!
The minimum visibility for civilian helicopter ops in UK under VFR is now 1500 metres, has been for some time.
So I wonder what icing clearance that "IFR" helicopter has...
The CAA normally deem school playing fields to be a "congested area", for which prior written CAA permission is needed for a landing.
I hope the pilot has learned the error of his/her ways because this is just the sort of incident the press love to pounce on, to illustrate just how dangerous helicopters can be.....