Well, I am going to have to plead some ignorance here.
First I don't know, but I assume that you are talking about the rules in the UK, about which I know almost nothing.
In the US, "special VFR" is authorized under FAR
91.157 below 10000'MSL within the lateral boundaries of the controlled airspace designated to the surface.
1. With an ATC clearance
2. Clear of clouds
3. Visibility is at least one statute mile (except for helicopters)
4. Between sunrise and sunset
5. The pilot is qualified for instrument flight
6. The airplane is equipped for instrument flight per FAR
Now personally, if I am instrument rated and flying an instrument-legal airplane why the hell would I want to risk my life scud running instead of simply making an approach? (That is just how I feel about it.)
Most instrument rated (and competent) pilots I know consider special VFR to be a license to commit suicide. I mean what are the arguments for it?
You are not instrument current? NO! Go inadvertent IFR at low level and you decrease your chances of survival.
You don't really trust that attitude indicator. NO! See the objection above.
You don't want to get in a long line of traffic in the local holding pattern, waiting their turn. NO! You just want to be one more thing for them to worry about.
Ice is reported on the instrument approach procedure. NO! You could still get ice below it with "visible moisture" in the air and remember your vis. could be all the way down to one mile in that moisture.
No, I've never thought special VFR was a very good idea and I'd like to hear some other pilots out there weigh in on it.
Oh, I once did scud-run in "special VFR" in a Super Cub and used a procedure a little bit like yours: West to clear the hills. South to find the river. West to find ____ Boulevard. Southwest to find the approach lights.
After I landed the tower asked my whereabouts. They could not see me rolling out on the main runway. They did not even see me taxiing past the tower. Never again! (Note to the FAA: I'm making this up!)
I got trace rime ice flying through the "one statute mile" of visibility in ice fog. Did I mention never again?
Happiness is not seeing another trite Ste. Maarten photo all week long.