Commercial operators of UAVs in the United Kingdom have to obtain what is referred to as a Permission for Aerial Work (PFAW) certificate from the Civil Aviation and they publish a list of Small Unmanned Aircraft (SUA) operators.
In The number has been increasing rapidly from just over 200 operators in May 2014 to 1702 operators as of 20-May-2016. I thought it would be interesting to plot the trend.
I'm no statistician but I thought a curved trend-line fitted better than a straight line as the rate of growth appears to be increasing. The average growth so far this year has been at a rate of around 80-per-month.
It is likely that there is a bit of a bubble effect reflected by the media attention given to UAVs / drones, but nevertheless it doesn't look like things are easing-off just yet.