They have the monopoly in the area, I think they merged about four local firms a few years ago. I used to use them twice a month, same time, same route. I got to know a few of the drivers and knew the price but some different ones always tried to add a couple of quid on. In the end the owner put a set price on my fare to stop it happening. Recently I used one to the airport at 4:15 am and it cost £17. Four weeks later I returned at 3:30am, ironically the same driver and he charged me £23! I was going to call them and query it but totally forgot in the end