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Outdoor floodlights have stopped working

Hi We have 3 outdoor LED floodlights, which are on a single circuit/switch from inside the house. There is a fault where if I turn the switch on, the RCD on the circuit pops and the lights don't work. Please locate and repair the fault. Notes; - Some cabling is easily accessible under the house, some is buried in conduit. - The light fittings are on poles, about 2.5-3m high - The light fittings are approx 3.5 years old (installed Feb-March 2019)