My thinking is that if I'm at +2000ft, I should be able to get a couple of miles within the zone (i.e. approx half way to London City) and still be able to land clear to the fields close to the Dartford bridge (or make the runway at London City) should it all go horribly wrong at the very worst moment.
I'm not overly concerned at this stage about actually over-flying London City airport itself, it'd just be nice to venture a little bit closer to the City than you're usually allowed on any other day of the week. I think from 2-3 miles away you should still have a pretty good view...
Can I expect Thames radar on 132.700 to be particularly busy or will they most likely be twiddling their thumbs early on a Sunday morning?