we don't just push in a bayonet plug and charge £50 !
first we examine the exisiting installation and see if it conforms to the latest regulations or if there are any other problems, safety hazards etc.
then we connect the hose to the cooker using joint sealing compound and connect to the gas supply.
then we check for any leaks.
Then we level and make the cooker stable.
then we have to commission the cooker, light and examine all burners, test all controls and safety devices.
then we have to instruct the customer in the use of the appliance.
also take in to account the money we have to spend every year on gas safe registration, assessments, training courses, public liability insurance, company vehicle, tools etc.
lastly, compare us to british gas who charge twice the price !