Circular. Prof Jeff Duckett, accompanied by Pam H (Mobile No: 07777 698070) will lead a gentle walk down the Grand Union Canal past Stockers Lake and the only chalk pit in Middlesex, exploring the rich plant diversity. Jeff is Emeritus Professor of Botany and recipient of the 2008 Linnean Society Medal for Botany. He works as a Research Associate at the Natural History Museum and has over 50 years’ experience of London’s vegetation. Please bring a picnic as facilities are limited. Café and toilets available at Bury Lake, near the start and of the walk, and in Rickmansworth. Joint walk with Hammersmith, Fulham & Wandsworth Group. Map: E172, L176.