any minor problem way beyond the control of OC Ops Northolt could see him in severe do-do
As I said above - OC Ops only approves the Landing or departure at/from Northolt. You could quite easily take an SE into Denham, White Waltham, Fairoaks, Brooklands, or even Heathrow (if you could get the landing permission!)
The actual clearence to bring a SE aircraft into the LCTR rests with the Controllers working "Special", "Thames Radar" or "Northolt Approach". As long as the criteria contained within the UK AIP AD-2-EGLL-1-2.22 and AD-2-EGLL-3-1
MM