The first named crew is on the Bucks Station
 316) Wimbleball/Upper Thames (=E)─┐
                                   │ Wimbleball/Upper Thames (=E)     
 317) Lymington / Poole (=E)───────┼──────────────────────────────────
                                   │ 3:14 easily                      
 318) Twickenham (=C)──────────────┘