Boltar wrote:
On Mar 27, 12:43 am, "John Rowland"
wrote:

have just laid it on top of the brick channel walls, so it can't be
a cable run. Does anyone know what it might be?

Perhaps it carries sewage pipes?

Thanks, an email correspondent has suggested that it is a pair of beams
which used to carry a pipe, possibly in connection with the recently defunct
pumping station in Beck Close.