Environmentally friendly private hire at no extra cost! At greentomatocars, they believe that going green should not cost more. That is why they have set their prices in line with existing private hire providers and do not charge a premium for going green. Indeed, in some areas they do quite the opposite, their airport rates and £18/hour waiting time being reductions on the norm. Further, they do not charge a booking fee or obligatory gratuity like the black cab circuits, nor do they charge for the distance the vehicle has to travel to get to the pick-up.