Aren't Wago connectors one of the greatest DIY inventions! Got called in today to fit a new fluorescent tube assembly after a friend removed the old one only to discover he didn't understand loop-in. Typical 50's or thereabouts installation, not an inch of spare wire. But relatively easy with Wago lever connectors. Was glad of the Dremel to enlarge the hole in the tube carrier though. Couldn't poke the wiring and Wagos back into the ceiling because the wiring (four off 1mm t+e) had all been threaded through a 15 mm hole in the joist.
Also used a couple of Grip-it's to fit the new tube to the plasterboard ceiling rather than hunt around for the joists. First time I have used them, seemed to work well.