Right - thanks for comments, interesting. Anyway I've done further searching and found the tech data - seems the Nominal Rate QN (whatever that is, presumably some gas output) is 2.25KW for the Grill and 2.5 KW for the Oven, it seems marginally less for the grill than for the oven (although I don't know is that per hour or what time period or what bearing that has when you compare Gas Mark 1 and Gas Mark 9). The oven has a light! 25w. Seeing as there doesn't seem to be much difference I will keep going with the oven, the other benefits are clear, cooking multiple items together, less turning required, less chance of burning not to mention my oven can be programmed to turn on and off at prespecified times. Mind you the oven doesn't fit in the dishwasher!!