mmmm... stick with gas probably if the consumer unit is 63 Amp. Shower's probably 9KW, off the top of my head that's around 35 Amps, more than half capacity gone for a start. If the oven's taking 12 and a dryer is taking 10 that leaves fuck all before the main fuse pops... There's sites that can do the math for you, definitely worth a look before you leap!