Is it Friday already Dexter :-))
Perhaps I am blind, but it seems to say nothing about being required to fly within sight of the surface under rule 25 for flying in class B airspace. The Licensing Division of the CAA reopens in 45 minutes, I shall telephone to enquire about this.
Good luck. They will read schedule 8 to you, just a 2 donks did, and then you too will see that a JAA PPL issued in the uk must fly in sight of the surface unless he has an IR or IMC. It applies to those PPLs wherever they fly, article 123 and all that.
This has no bearing on the uk's definition of VFR, VMC or indeed any other country's. We already know that under VFR a flight can usually fly out of sight of the surface in most countries, and the uk is no exception.
As for class B airspace, that is a good'un. Do you fly in the uk much? I'd guess not

Which class B do you fly in