I am unable to inform you of 'where' to find the information, but can 'suggest' you look on the CAA, or maybe BAA website. Must be something there.
In the 340, i use the PAPI/VASI guidance facility until i beocme comfortable with landing the aircraft by judgement. There is no set procedure, so to speak, as to how to follow the lights, except the obvious color changes.
On runway 23 at LHR(EGLL), i used the lights until about 250 feet or so, and when the landing is confirmed (no go-around), i continue with altimeter glances. . .When flying specific procedures, for example landing, it is best to and pretty much SOP, to have one set of eyes out the plane, and one set in. If preferred, lighting guidance systems when being used in larger aircrafts can still be used all the way to touchdown, but only if the light colors are accepted to be incorrect by the pilot, just different because of the size of the aircraft.
Hope this gives you a broader idea.