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Royal Horticultural Society Gardening Matters series, No. 1 Front Gardens - Are we parking on our gardens? Do driveways cause flooding? Includes designs for front gardens with parking, and information on porous materials:
https://www.rhs.org.uk/science/pdf/Gardening-matters-Front-Gardens-urban-greening.pdf
Greater London Authority - Grey to Green - A guide to community-led depaving projects
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https://www.london.gov.uk/sites/default/files/grey_to_green_guide.pdf
Royal Horticultural Society (RHS): Front Gardens: Design Inspiration
https://www.rhs.org.uk/advice/profile?pid=879
RHS Front Garden Planting Guide
https://www.rhs.org.uk/advice/profile?pid=877
Southwell Road, Lambeth, Community De-Pave Garden
London Wildlife Trusts Garden for a Living London campaign:
https://www.wildlondon.org.uk/campaigns/garden-living-london
Greenspace Information for Greater London (GiGL) the capital's open space and biodiversity records centre - detailed information on London's wildlife, parks, nature reserves, gardens and other open spaces.