Lets say the cloud base is only 1800ft on the day. I can't depart under VFR as I can't maintain all the separation. To make matters interesting lets also so the viz is only 4.5km.
Isn't there a "below 3000'" bit, which if I recall correctly is "clear of cloud" or words to that affect?
I have flown SVFR in two different scenarios:-
1) Flying to the channel islands. Actually although it is SVFR it is no different from VFR, except you'll be given clearance limits (E.g. not above 2000', heading 180 etc....)
2) Flying in the USA where SVFR means something totally different - i.e. flight in conditions sub VFR, e.g. 1 statute mile vis.....