140Cherokee, then I suggest you ask either the CAA or an aviation lawyer how they interpret it so, because they do.
My understanding, though I am not a lawyer, is that the ANO bans flying in general, then lists certain permitted exceptions. The passages I marked show that gliders are exempt from registration and Cof A, and their pilots are exempt from licensing.
Power planes and their pilots are not so exempted, and furthermore the pilots, if having only a PPL with no other ratings, cannot fly in cloud. With IMC or IR they can, in differing degrees.