^^ +1
However, some Planning Offices may consider on a case by case basis that, notwithstanding the fact that it's not listed under exempted development, the insertion of a velux on the front face of a roof is a non-material change to the building that does not deem it inconsistent with itself or with other property in the area.
Like I said, it's on a case by case basis depending on the type of property, whether its within an ACA etc etc etc. and not all Local Authorities do this. There appears to be some relaxation by some LA's in recent times because of the arrival in the 2007 Exempted Development Regs for solar panels on the roof of a house which are certainly more prominant than a rooflight!