This video is called Camley Street Natural Park, London Wildlife Trust 2009.
Another video is An Introduction To Water Gardens.
From Wildlife Extra:
New wildlife habitat created in the heart of London
Paddington Recreation ground to get new wetlands
July 2009. A new wetland wildlife habitat is to be created in the heart of London by Westminster Council and environmental charity Groundwork London. They are working together to create a new open water area and wetland meadow in Paddington Recreation Ground.
This is the latest phase in creating a dedicated 3,200m nature area with the addition of a series of wildlife-rich ponds and marshlands that it is hoped will attract a variety of species including frogs, toads, water voles, great crested newts and dragonflies.
New timber decking pathways will surround the ponds to give visitors full access to the water and damp meadow habitats, and a wooden ‘dipping’ platform will also be built to allow school children to take part in pond-dipping and learn about the variety of animals that live in the water.