There have been incidents where a member of the public have seen a
model aircraft disappear from view, they have phoned the Police or emergency services to report an aircraft crash......yep! it's a quiet day, so they all rush out on a full scale attendance, but nobody makes a basic enquiry to establish wether there was, indeed, an aircraft transiting the area.
Same with hoax fire calls and false intruder alerts (Hatton Gardens excepted
) I believe it's called "jumping the gun" and appears to have happened on this occasion....If they hadn't done their practice response on this occasion, they would have just repacked their kit a half-hour earlier.
To suggest this response to a false -alarm has cost a fortune, is disingenuous.
I bags second trip, Flyingmac.