VP959, isn't this *exactly* what the "experimental" category is for? So that the CAA can issue a Permit to Fly to anything that doesn't fall within established design categories?
We usually associate a PtF with LAA-type homebuilds (kitbuilt or plans) but the CAA can also issue these directly, thus bypassing the criteria the LAA has established for itself.
There is footage of the aircraft flying, so does it have a Certificate to Test?