The police say they will only be used when the weather is too bad for normal SARs op's.
Having seen the weather the SAR crews do operate in then you have to ask when these will ever be used then...
SAR helicopter has - RADAR , NVG, FLIR, 4 sets of eyes minimum, a gazzillion years experience...
UAV er 1 camera and an operator trained by the clydebank model flying club..
That said, they are probably no greater risk to you than the average model aircraft and we have quite happily survived with them for many years.