Loft Insulation Question

[Doofus]

Can I lay loft insulation directly on top of the existing flooring boards?

As far as I can tell, beneath the boards is sheeps wool, but only 8-10cm deep. If I leave all that there, and lay a 27-30cm layer of new insulation over the boards, will that give me any issues?

I know it'll reduce thermal bridging, but that's all I know.

I suppose what I'm wondering is

1) whether any existing gaps beneath the boards will render the new insulation ineffective.
2) what else I don't know.

TIA

PJ