As one involved in the SmallUAS industry for several years now I can assure you that what is proposed is not 'research' or 'test' flying. It is work undertaken for a straight commercial purpose. So you do require a CAA permission for aerial work.
It is an expensive process just to get an £800 multirotor in the air and operate commercially.
There are a lots of people who have paid to get the 'ticket' and found actually making it pay is really hard work. They are always on the lookout for regular business and would welcome jobs like this, especially if they are local. I'd suggest trying to find one. Just Google ... drone operator yorkshire.
At the very least it will give you an insight into what can be achieved.