Chisel out the mortar and lay the wire in the recess between the bricks and remortar. It's very seamless and if you aren't comfortable doing it a brickie should be able to do it very cheaply.

you can get PIR sensors that need batteries and are wirelessly connected to the main control panel so you should only need to provide a power source for the control panel.

@Heather sorry - missed your precious post above your image! Yes we have to get someone to make us a framework and the idea was the lights would come down the side of the extractor (hidden) and be strung through from the top of the frame over the seating area. Because the electrician has put them in a different section of the ceiling then we can’t do that anymore so that’s why we have the issue we have :0( They were honestly just useless! Bah. - Re my spider light. Well the one I have for the dining area is huge! LOL. It has 8 arms - all black and a large round ceiling rose (like 8” or something like that) Not very elegant. I did think about trying to stretch it across to the island BUT it’s on a separate switch so it means I would always have to have the main light and island one on at the same time if it did that :0( Had it over a week or so and it’s nice so not sure I can send it back now (plus it has bulbs in it so worried it might break) - I think I will just have to put something In and see what happens when the frame goes in. Just a while off yet. Ha ha Thanks everyone!

Is it the cable between the cutout and consumer unit? The bending radius of the armoured cable will limit your options. If it’s not between the cutout and consumer unit then it could probably be replaced with twin and earth if the cable is suitably protected. Personally I would chase out the wall, replace the cable and fill the chase the gyproc easifill. It is the best and nearest solution. Boxing in would be the cheapest and easiest option with the least disruption but if done considerately shouldn’t be too obvious when completed. You could hide it behind a cornice but that’s potentially quite an expensive option if you’re looking at adding it to an entire room. You’re probably looking at the cost of a joiner for a day vs an electrician for a couple of hours (assuming you can do chasing and filling yourself). It’s cost vs disruption vs desired finish.