Stonehenge summer solstice bike ride anyone interested?

I thought it would be great idea to have a summer solstice bicycle ride from London to Stonehenge to concide with the London to Stonehenge pilgramage walk which happens at the same time. The meet up point each year for the walk is Battersea Park Peace Pagoda at 2pm on June the First. This is six months away so there is plenty of time for planning. It would be great for a critical mass to converge on Stonehenge in time for the solstice sunrise. What do you think? I have already mentioned this on the critical mass email list and it has got a good response.