http://www.caa.co.uk/docs/64/2009010...VFRPilotA5.pdf
Aircraft (except helicopters) at 140KIAS or less: clear of cloud with the surface in sight in a flight
visibility of at least 1500 metres. Helicopters at a speed which, having regard to the visibilty is
reasonable: clear of cloud
with the surface in sight in a flight visibilty of at least 1500 metres.
Copyright Civil Aviation Authority 2008 and reproduced with their permission AC&D 50/2008 ATS FAQ(A5)
18 DEC 08