There is a guided day out on the Lea Valley Walk on Sunday 14 April.
The three mile walk, promoted by the Lea Valley Park, will look at industrial heritage including filter beds, natural history, the impact of the London 2012 Olympic and Paralympic Games and Three Mills.
The start is at 9.30am from the WaterWorks Nature Reserve, Lammas Road, off Lea Bridge Road E10 7QB.
There will be a tour of House Mill at the end about 4pm.
To book a place, £15, go to the Field Studies Council website.