I have a wall light that needs it’s wiring checked/re-wired.

I purchased 3 wall lights, 2 of them I fitted and work fine. The third (which I’ve wired the same as the working 2) initially worked but after I mounted the fixture to the wall the light wouldn’t come on and gave me a nasty shock while tightening the bulb. Needs a professional to look at it to see if it’s the fixture itself or the wiring!

I also have an electrical projector screen that I’d like to mount to the ceiling. I want to conceal the power cable so I need either a power socket on the ceiling itself, or a brush plate that leads to a power socket in the loft eaves.