I understand that all ground floor sockets including kitchens need to be on RCD protection.If the existing board has an 80mA main breaker can new circuits run from this or should I install a 30mA RCBO or new 2 way RCD board ?
Not quite... With the exception of a TT earthing arrangement - all sockets that can reasonably be expected to supply outdoor appliances* require RCD protection. Properties with a TT earthing arrangement require all circuits to have RCD protection.
*With the infinite stupidity of some people, I personally believe all sockets in a domestic household should be RCD protected - that way when someone plugs an electric heater into the upstairs bedroom socket and trails it into the bathroom on a chilly night, atleast that person has a better chance of making it into their bed that night instead of a body bag.
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