Please stop referring to Poolies guide as an authoritative source. It's not...just a guide.
MikeJ, what you are referring to are the privileges for a UK issued PPL.
By way of example, I have an Irish issued JAA PPL without an IMC rating (we don't have one), and without an instrument rating. When I am flying in the UK airspace I am bound by the UK VFR rules (and the Irish ones if more restrictive).
I am not limited to the privileges of a UK issued PPL, only those of my Irish issued PPL which restricts me to VFR. Therefore the VFR rules is the only restrictions which are relevant to me. This is the subtlety that the others are trying to point out. Lots and lots of people operate in UK airspace without a UK issued PPL.
dp