I am fitting a new kitchen and am replacing my exisiting ceramic hob(5.5Kw) and oven (2.5Kw) with an new hob (6.2 Kw) and oven (2.5kw). It seemed straight forward enough but I am unsure about the existing circuits as they seem over rated. Is this a problem? My existing connections are: Hob 45A CCU on a radial circuit protected by a 40A MCB. The oven is also on its own radial circuit using a seperate 45A CCU procteced by a 40A MCB. I believe that they both use 6mm² cable. Is this ok or should i get this changed?