I want to install a new shower unit (Mira Sport Max 10.8kW) Can anyone advise me about uprating the consumer units' MCB (Crabtree Starbreaker). After reading some info it sounds as if I am required to fit an RCBO (50 amps) is this a simple task or can I getaway with uprating the existing MCB from 40 to 50 amps? Also I notice on RCBO's there is wiring to connect, does this require an expert? Finally, if the existing cable is only 10mm2 & 16mm2 is required, can I getawy with 10mm2 to run a 10.8 amps shower, or is it too risky? Thank you all.