Looking back on this saga, the best thing for me was that I did not have problems booking the IFR slots at Shoreham.
This really suprised me, given that 8am-9am they had just one IFR movement allowed.
The only explanation I can come up with is that other IFR pilots simply avoided flying - same as so many people (and probably almost everybody with money) avoided London.
I avoided flying through the RA anyway because I had no interest in summarily losing my license as per the CAA threat, on the slightest mistake or mis-communication. But IFR flights worked as usual.
I hope lessons are learnt for future events - notably that
- almost nobody will arrive in a business jet
- almost nobody will arrive by light GA
- hardly anybody will arrive by airline
- almost everybody with any money will avoid the whole thing