hi , i currently have a zanussi oven/ hob run from a 6mm cable and a 30 amp fuse at the consummer unit. i am planning on having a new double oven (bosch) 5000 amps and new hob (bosch ) 6400 amps . can i just upgrade the cable to 10mm and install a 40 amp fuse or will i have to run x2 supplies and x2 cooker switches.Wont be doing it myself but thought i would enquire before i bought the appliences , thanks