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@Hefty
The floor will either butt up hard to the skirting (no expansion gap, could well be your issue), or will tuck under the skirting (probable expansion gap but maybe not big enough) or there will be some trim on top of the floor that attaches to the skirting (probable expansion gap but maybe not big enough). If it’s option 2 or 3 you’ll need to pull off the skirting or trim to see, so it’ll start to get messy.
It ought to be possible to feel the difference between bouncy joists and a bowed laminate that will push down a few mm then firm up as it touches the floorboards, but it’s tough to do/explain remotely.