External light wiring (old pond electrics)

I will finally have some time to do this at weekend.

The external electric is actually a 3 pin plug, plugged in to a double socket in the conservatory. This is then terminated in to a very poorly installed junction box which turned in to a slug house so that will be going! My plan is to take the feed in to a new Wiska Box, take to another Wiska Box closer to location of lights and run 2 feeds from there to the lights with Wagos.

For info, the lights are LED 35w each so a total of 70w. (https://www.amazon.co.uk/gp/product/B088RD12NS/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1)

Just a few questions before I get going with it:

1) Is it safe for the electrics to be fed by a 3 pin plug? Or should this be on it's own fused spur? I've not checked whether the socket is a spur or on the main ring.
2) Does my cable between the 2 junction boxes have to go in conduit? I plan to use this: https://www.screwfix.com/p/time-3183p-black-3-core-0-75mm-flexible-cable-10m-coil/63318. There will be a run of around 2 metres horizontally and 3 metres vertically.
3) Does my cable going from the second junction box to the 2 lights have to be in conduit? This will be a run of ~0.5m for each light.
4) If yes to 2 and/or 3 any advice on linking the conduit (presumably 20mm) in to the glands of the Wiska whilst maintaining water tightness?
5) I plan to tidy up the entry in to the conservatory as well, it's currently a bare hole with some silicone. I was thinking a 10mm grommet would be best, is that right?
 
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