Al Barari villa — all the garden lighting, irrigation pumps and water features: what does the electrical side actually need?

You've put your finger on the real issue: Al Barari's whole appeal — the greenery, irrigation and water — means a lot of electrics living outdoors in constant damp, which is the harshest environment for them. What it needs:

RCD protection on every outdoor circuit. Anything outside or near water (lighting, pumps, water features, sockets) must be on an RCD/ELCB so a fault trips safely instead of becoming a shock risk. Non-negotiable in a wet garden.

Proper weatherproofing (IP rating). Outdoor fittings, junction boxes and cable glands need to be genuinely weather-rated and *sealed* — most outdoor electrical faults here are simply moisture getting into a fitting or box that wasn't sealed properly, especially with irrigation spraying nearby.

Correct earthing on pumps and pond/water-feature equipment, submersible and pond pumps in particular.

Your symptoms: the odd trip is classic moisture ingress on an outdoor circuit (the RCD doing its job); a dead light circuit is usually a corroded connection or a failed fitting where water got in. Both are traceable.

Because it's a big, wet, outdoor-heavy setup, the sensible thing is a periodic check of the outdoor circuits and fittings rather than waiting for trips — a team that maintains Al Barari villas will know how these gardens are wired and where the weak points sit. Don't ignore repeated trips: a tripping RCD in a wet garden is telling you water is getting in somewhere.