35 purchasing or procurement services performed for others in the field of gas, gaseous fuels, oil, and electricity, cookers, fire places, room or space heaters, wall heaters, convection heaters, convection ovens, fan heaters, water heaters, gas boilers, gas central heating systems, microwave ovens, tumble dryers, dishwashers, washing machines, showers, fireplace surrounds, hearths, burglar and fire alarms and gas detectors; retail store services and mail order catalogs in the field of gas, gaseous fuels, oil, and electricity, cookers, fire places, room or space heaters, wall heaters, convection heaters, convection ovens, fan heaters, water heaters, gas boilers, gas central heating systems, microwave ovens, tumble dryers, dishwashers, washing machines, showers, fireplace surrounds, heaths, burglar and fire alarms and gas detectors; exchange trading gas, gaseous fuels, and oils; credit card registration services