Think everyone is missing a very big point here.
To start the ATPL (A) or (H) theory course with Bristol you need an ICAO PPL (A) or (H) respectively. As you currently don't have a PPL (A), you may need to finish the ATPL (H) theory, and once you obtain the PPL (A) at a later date, you simply do the PofF and Performance fixed wing paper.
I really don't think Bristol are allowed to give tuition and get a student through the ATPL (A) theory course without them holding a ICAO PPL (A) at the start-in fact I know their not. It is a pre-requisite and all! Sure they don't want their approval pulled...
Give them a call though, they are very helpfull
HB