PLA fluvial flow flag at PLA website http://www.pla.co.uk/
The recirculation pattern in the marshalling area is:
Crews marshalling alongside Isleworth Ait: proceed in a loop up to Richmond lock, turn, downriver to the downriver end of Ilseworth Ait, then turn. Do NOT go downriver of the bend at the Pink Lodge.
Crews marshalling alongside the Middlesex wall downriver of the Pink Lodge: turn at the Pink Lodge, proceed downriver to the Syon crossing, turn to Middlesex. Do NOT go past the Pink Lodge.