thankyou for reminding me of the Clapham Artic - although veterans may remember van on the A3, which was far, far scarier...
I don't know why I didn't think of Trafalgar Square, but, having thought about it for a bit, and refreshed my memory with a look at google maps I think it would be jumping out of the frying pan in to the fire. The traffic to the south of the Square is very, very difficult to predict. I don't think it would be practical to break the flow. We'd almost separate as we got away down Northumberland Avenue, and I'm with Claudine and Slo'mo' in thinking that it's nice to get away with a bit of a swing. Having said that - I'm tired of HPC. It's a nice place to meet, but the start is fraught.
I'm struck by the (not entirely unanimous) support for HPC. My current thought is this. The ride to Whitstable will have an experimental start. Like srw I'm fond of the City, but one has to accept that there are disadvantages - it's very easy to get lost, there are very few public spaces, it's really not clever for the Brighton and Felpham runs (Tooting High Street is a dream compared to Borough High Street).
I'm a big fan of the More London, Tower Bridge, Butlers Wharf area, having seen it come from nothing to its stylish present, but, again, it's no good for Brighton and Felpham, and it's not fun to get to from Paddington, Victoria or even Waterloo.
Kings Cross/St. Pancras is pretty fancy, but I suppose I have to take in to account that the biggest wodge of riders comes from the south, southeast and west, and (I may have got this wrong) there's no obvious space for the signing in and the safety talk.
So, for the moment, I'm pondering the South Bank as a one-off. I'm going to have to pop up there for a bit of recce, but, taking the rides in turn...
It adds half a mile to Brighton and Felpham, although it effectively does away with the Fulham Road Variation.
It shortens the Whitstable and Southend rides by two miles (before you start measuring, bear in mind that we take a lengthy tour along the Embankment. we can schlepp along the riverside for a bit, and maybe go under Tower Bridge for an architectural diversion.
If people don't like it we'll revert to HPC - but after six years I would like at least to try a new start point.