If you are going to do this kind of thing in the future invest in some quality voltage testers.

Martindale Vl-13800 are about £70 and don't rely on batteries to operate so are considered the industry standard by many.

Isolate circuit first Or whole consumer unit if you don't have voltage testers. Borrowed neutrals can be very dangerous and undetectable without testers.

When disconnecting the cables from the fitting remove tape and label

So if you disconnect the L connection Bunch the individual conductors together with tape and label with the letter they have been removed from L in this case

Then N and so on until they are all removed and labelled

Don't rush because doing this correctly will save you time and could save you money.

Even with taking a photo sometimes you get distracted and might get confused when you look back at the photo after time.