Morello

I'd like to thank you for this suggestion, there were various steps necessary including WD40, and each fitting had to be removed from...

Thank you.

Interesting! Thanks.

try 2 panel pins in a bit of wood

A pin spanner or a C spanner would be the best options for opening those fittings

Water pump pliers might do the trick. Tape the ends to prevent scratching the fittings

Good idea, thank you

thank you, I'll check those out

Most are in the hallway upstairs and various other rooms too. Re your second question, the one in the images has now been opened by a...

will try, thanks

At least 20

will try, thanks

Yes, sorry if I wasn't clear. That much is obvious to us but it won't move and we have no tool.

Just moved into a house which has downlights everywhere. We are gradually swapping over to LED but have encountered one type of fitting...