And there was me thinking it was purely there for CPL examiners to make you sweat asking questions before/after your flight.
There are also other slight differences in that the 1500ft rule over built up areas dosn't have to be respected, BUT THE GLIDE CLEAR DOES.
Its something that most pilots accept if given and don't really understand what they are accepting. Most just use it to gain access to controlled airspace and to the pilot it seems its the same as VFR. To the controller it is very much different.
MJ