Patches of dampness in living room laminate flooring

It is very likely that the damp will be from an external source or radiator leak. It may be that there are breather vents on the exerior of the property, low to the ground. This is because it is most probably a suspended wooden floor in that type of property. There can be issues if these vents block and debris starts to gather around them, as it soaks up damp, also look for damage to the lower outer areas of the property. Another possibility is there is no damp course or the gap between the damp course and the ground is not enough. It should be two courses of bricks minimum. Rising damp in the walls would point to the same causes, as the damp will migrate to section of flooring running along it. Basically, fix the rising damp and the localized damp issue will be remedied too.