Hi Bookworm,
If you arrive outside the peak traffic times, then you stand a fair chance at night on a SVFR clearance. Ally Pally to Crystal Palace on Westerlies is not a huge problem, but on Easterlies it can be much more difficult. When City is closed on saturday afternoons/evenings, you stand an even better chance, depending of course on higher priority traffic in the zone.
Hi BBF,
Thank you for your kind comments. Several Thames and City Controllers read PPRuNe, so I am sure they will appreciate your words as much as I do. Now how about some fam flights with Cityflyer?