Thank you - even if your reply is a little disappointing! So it means a previous owner must have taken it apart and decided those additional screws were the best way to put it back together again. Oh well. I'm planning to strip it all out to replace the floor some time soon, so I'll see if I can figure out why they did that and maybe put it back together without those screws. What you say seems to be borne out by the photos over in the
camper van interior website, although those photos are just a little bit low res to see clearly.
These two almost certainly show no screw heads on the bit just ahead of the wardrobe:
But this one seems to show the same two screws that I have above the fridge:
So how many screw caps have you got in your worktop - I've got a couple in each fixed piece, i.e. the two narrow end pieces and the back sections of all three lifting flaps.