As intended, on 15 November (a mercifully sunny day) a volunteer group from the Royal Bank of Scotland helped begin the major task of clearing the rivulet of duckweed.
The bank also kindly funded the attendance of the lead team from the Trust for Urban Ecology, whilst our friends at the Dulwich Society funded the eighteen tons of chalk placed in the water (this has the natural effect of suppressing re-growth).
As for shifting the chalk, that involved state of the art technology; spades, wheelbarrows and sheer physical effort!
Below is a gallery of images of the work involved. To see a larger image ckick on the thumbnail.