Could you lead a River Brent clean-up?
Have you been on any working party to clean up the Brent or other waterway? If so, you might consider whether you could lead a party sometime instead of just joining in.
The River Trust is organising a two-day training course on 12/13 Feb to equip people to lead a small group. If you are interested please contact Nic Ferriday at firstname.lastname@example.org