The boot latch microswitch is "probably" OK, I have a few spares if you really do need one.....
My experience is that plastic/nylon interior parts of the boot latch wear or break. The "usual" problem (based on my multiple experiences and taking the latches apart) is that the boot will then not latch shut at all or jams.
The microswitch not being triggered is probably secondary - if you take one apart you'll see why.
To be honest, it's best to get a good latch from our sponsors, and check it works properly before fitting as well. (I have been sent a faulty one, which was speedily replaced with absolutely quibble at no cost to me.)
You can check it opens and closes properly by using a chunky screwdriver shaft to emulate the latching post, and test the wiring/microswitch with a multimeter.
Replacing the latch isn't at all difficulty, though you do have to take the boot lid interior trim off to get at it. Due to excess practice I can do that in about 5 minutes! 
If you can risk having the car without a boot latch for a few days take it off and investigate. If, like me, it's parked outside and accessible get a spare first.
But if it's failing there's a good chance that when you remove it the damaged parts may just fall out making it inoperable.
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions, ski hatch retrofit; extended leather. Aftermarket DVB-T, reversing camera and full XCarlink (Bluetooth etc.).
2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation".  (A much rarer model than a D2 S8 by the way!) Oh, and a brand new engine at just under 30,000 miles on the factory one! 
Finally: gone, but not forgotten.....
1998 D2 PF S8. AgateGrey/Platinum. Every option (I think) except electric rear seats, tiptronic steering wheel, ski hatch, towbar & dimming door mirrors.
e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course.  (internal dimming mirror added later)
1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon, Auto-dim mirror, Leather, Trip computer, Cruise control, OEM Ford SatNav with CD changer.
And before that a lot of Rover 800s, a few oddities, a lovely Triumph Dolomite 1850HL with Overdrive and way back in my schooldays an Austin Seven aka Mini 850!
Last edited by HPsauce; 23rd November 2018 at 05:47 PM.
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