Thanks for all the replies - I think this is going to happen, just finalising the design and don't worry I'll be sure to provide updates and photos for a giggle!
OK so a busy few days and I admit to doing something that I would normally never do - that is ask some pros for advice (you lot!) then ignore it. Reasons being a) I had timber, plasterboard and multi finish to use up and b) my design was a lot simpler than the one in the original photo as I had less space. So apologies for that but I'm pretty pleased with the results - just need to finish the electrics: Then move radiator, skim and paint:
Woooooo - when you get results like that, feel free to ignore everyone else Have to admit, I initially thought you were an inexperienced DIYer who had great ideas but not the skills to put them into practice. I was wrong No wonder you're chuffed
Haha. Just need to find some suitable (shallow) downlights now. I had bought some but they have a 60 degree beam and a lighting guru says I need more like 10-15 degrees!
Make them LED if possible - the heat given out by halogens can be quite scary (thinking of anything in these smaller recesses which will get cooked...)
They will be - I'm thinking these - https://www.downlights.co.uk/miniature-adjustable-led-collingwood-dl120.html Pricey though!
You might also want to consider dimmable. If they'll be orn at full brightness, they could be distracting - especially if there's a TV in that room.
The SF ones he linked to in post #1 should fit, shouldn't they? http://www.screwfix.com/p/lap-recessed-led-kit-white-10-pack/14396#_=p
I doubt if they could be wired in now, looks like the cable is already in and trying to pull those cables through now would be a mare! You may need to look for this style https://www.ledhut.co.uk/spot-lights/ceiling-lights/6-watt-led-downlight.html The wattage on these particular ones is probably too high, but they are only 12.5mm thick so sit inside the thickness of the plasterboard. The traditional style would need about 80+mm of space inside the "shelf" to fit and I assume your timber is sitting in there? Although obviously hard to tell from your images how you constructed it under the plasterboard
Just looked at those LED's not sure you would know 82 lumen lights were actually on, would go for something a bit higher and dimmable so you can control it that way
Who knew downlights could be such a minefield! This could be the second lot I have to return after the first lot had too wide an angle! It's constructed in a way that I can easily pull the cables back through, plenty of slack to do so either way should I need to. Dimmable seems tricky as the drivers all seem to be bigger than the 44mm cutouts so I'm not sure where I could hide one. These aren't designed to light the room, just to cast some lighting on pictures or ornaments so I thought the less the better?
will you be taking advice? if not here are some options: arc welder pitch floodlight candles strobe light fireflies in a cage mobile on flashlight setting