Right here's the info...there's a small 2-way consumer unit in a external garage. Just a 40A main switch with two MCB's one for lights & one for sockets. Was adding lights & sockets today & the guy I work with said that as we were adding to the circuits we'd have to replace the main switch with an RCD. The supply to the garage is RCD protected so surely there's no need to do this as the circuits are already RCD protected?! I could see his point if the garage supply wasn't be RCD protected but it is.
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