Alan M,
Would it be too much to ask for you to draw both the Easterly and Westerly scenarios plus the missed approaches to all runways plus the procedural tracks that an R/T fail aircraft will fly from the hold to establish on the ILS for each runway.
The place to go for something like that on a nice big wall chart is actually an estate agent in Uxbridge - they get them from the council for noise reasons when BA Captains want to purchase a local pad to use pre-early morning departure!
The problem with allowing flights to transit a corridor with no R/T provided they have a mode C is - how can the non r/t pilot know that the mode C is actually working and how can ATC know that the level indicated is actually correct without verification.
The idea of a corridor from South of Gatwick to North of Luton would be interesting. Since most of the IFR routings below FL100 force pilots to route round the outer edges of the TMA and not just the LL zone, some IFR flights might be very interested in taking that short cut! (change to VFR for the period of the transit).
The comment about making the CTR class D I believe is going down the wrong road because it advertises something that may not actually be available (random routings at random levels by VFR flights).
However, the point regrding SVFR separation on the BUR-Ascott route brings me to a partial solution - Retain Class A airspace. However, establish a class D corridor or corridors from SR-30 to SS+30 each day along those routes. Basically everything would remain the same except for the requriement to separate SVFR flights even when the weather is VMC. Ease workload - increase capacity.
Make a pre-departure FPL and pre-departure slot time for the corridor mandatory (all done by an online computer booking system) and hey - ATC don't have to separate, can predict what the loading is and restrict it to a sensible level. Too much hassle? - But you do want this ability to transit LL zone for the benifits it gives in getting from A to B rather than a simple jolly/ freedom of the air issue don't you?
Regards,
DFC