This report represents the results of a watching brief (TL 4859 9743 and TL 4786 9720) carried out at Must Farm, Whittlesey, near Peterborough. Through 19th February to 26th March 2009 regular visits were made to monitor the machine excavated materials generated by the topsoil stripping and trench excavation of the repairs to a cut-off wall. These repairs focused on two areas of the wall that was constructed in 2007, where the required depth into the Oxford clay had not been reached. The work was commissioned by Bachy Soletanche. The process of installing the wall involved the continuous cutting and immediate in-filling of a narrow trench up to 12m in depth. As with the 2007 investigation (Interim Report 2007), this meant that monitoring was focused on gathering potential archaeological material from the up-cast deposits of the spoil heap. The monitoring revealed no further worked timbers or other archaeological artefacts, but as with the 2007 investigation, it did identify the difference in deposits where the wall bisected the known Bronze Age palaeochannel.