The Spit/Hurricane usually tuck-in at the last minute from their hold which is usually over Fairlop. The main formations get themselves organised over the North Sea using Southwold as the datum, but the Reds usually slot-in further down the route, and BBMF join-in last of all.
Re- earlier comments, bear in mind that Harriers did take part once – at the BofB 50th event. Very impressive they were too, although the rehearsal at Wittering was even better!