Originally Posted by gerardflyagain
When would SVFR be used in Class D airspace?
Not least when you require Standard Separation in less than VMC but are unable to accept an IFR clearance.
For UK SVFR: search for CAP393 Air Navigation: The Order and Regulations and then search Special VFR Flight.
‘Special VFR flight’ means a flight conducted in accordance with the Visual Flight Rules cleared by an air traffic control unit to operate within a control zone in meteorological conditions below Visual Meteorological Conditions;
It is 'special' because it it a control zone access/egress concession for non-IFR in less than VMC.