There is no regulation stating that new circuits must have RCD protection. Things that do require RCD protection include; Socket outlets used by unskilled persons, Cables buried in walls without other means of protection or greater depth. Circuits on TT installation where disconnection times cannot be met. Accessories which manufactures instructions state they need RCD protection. But new circuits do not. This is another myth within the industry and one of the dangers of internet forums where anyone can say something is a fact without any backup from regulations or their peer group.Doc H.
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From the description you have given; your cables will be run on the surface, in either trunking or conduit, there will be no cables crossing the garden and the fixture will be on the outside wall with the cable terminating at the light, (No external junction boxes). As such there is no need for either RCD protection or LABC notification. It can be good practice to supply all external accessories via a suitably positioned double pole isolating switch, such that in the event of mechanical damage or water damage all live conductors can be easily isolated. This is not a regulation though.
Note: When viewing forum answers, all members have some green reputation dots on the top right of their posts and a count of any likes received. This can often be a good indication of the quality and accuracy of their posts as monitored and acknowledged by other members. (Red dots are negative points).
Doc H.
