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The only place for a coil spring is up Zebedee's arse
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The switches In my interior lights don't work, and I was wondering if anyone has worked out the correct replacement from RS or wherever... They're the little square metal latched variety with the trim-coloured button on top...3 in the main overhead light...

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I haven't found a replacement, no - but I have sucessfully de-soldered them and opened the switch up and cleaned the contacts internally and got them working again.

However, if all of them don't work, then check the PCB in the overhead light unit - I've seen it before where they've had moisture drip down (possibly just from condensation even off the metal roof) and over time corroded one or more of the tracks away on the board. I've repaired a few by bypassing the affected area by soldering a new jumper wire on.

Marty

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Thanks for that Marty - i've tested the tracks and have continuity on all... I blasted the switches with contact cleaner (optimistic I know) but I'll retest the whole circuit before going with the de-soldering option. There had defo been some sort of condensation issue, and the lacquer had come off one of the tracks

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Tested the circuit...definitely the switches... the logo on the switches looks something like 3SE, but in slightly digital font... does that mean anything to anyone?

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Glad Marty answered, I was looking for a console which I've replaced to look at it. The switches look "plastic welded" to the console itself, and a small board attached to another. Can't you find the entire console to replace, wouldn't it be easier?

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It's been awhile since I've had one in front of me, I'll be honest! I can't fully remember how the switches go in there - I'll try and have a look online for a picture of one of the panels.

I've currently only got a L322 here, and they're completely different beasts!

Marty

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I followed marty's suggestion
..it was v quick to remove the abs mountings of the switches with a soldering iron . The switches are a bit fiddly to open, but easy to clean once inside- I used a fibre glass pencil to remove the dirt. Then drill a 1mm hole where the switches sit and use small screws to mount them