Dear all, my house has a 15 year old installation with a Wylex consumer unit with MCB's but no RCD's within unit. I have a dedicated RCD for power shower and dedicated RCD socket for garden use. Everything works normally and I would prefer not to have to replace CU etc. I require a spur from downstairs ring to be installed to my detached garage with a RCD in garage for sockets. I intend to use local contractor, I would value you views on how my requirement fits regulations, Best Regards.