I bought a strip light fitting holding four GU10 lamps, from John Lewis. It is mounted to the concrete ceiling by its central mount point.
John Lewis supplied four lamps. I fitted them and switched on. The illumination was pathetic. I checked the packaging - 330 Lumens.
Fortunately I had some 450 Lumen lamps that I had purchased from Costco. When I tried to remove the John Lewis lamps, I could not gain purchase. Stumped for a bit I googled and found a little gadget advertised for £1 plus £3,95 packaging that supposedly did the job. I decided to chance it.
When it arrived, it comprised a short handle hinged to a head with a diameter much smaller than the lamp and covered in a concave disk of the kind of plastic used for 'Screwy Louis' for opening jar tops.
Anyway, I gave it a try. Push up, twist and remove. It worked perfectly. I reckon it was value for money.
If you are interested the site is: