Here are some links to other websites that you may find useful:

Royal Horticultural Society

Garden Organic

National Society of Allotment and Leisure Gardeners

Exmouth Town Council

Charles Dowding's NO-DIG website

"Wildlife on Allotments" pamphlet by Nature England

Seed Swap - to facilitate the
swapping and exchange of heritage/open pollinated seeds (not hybrids).

Our Place Our Planet - Steps to reduce our carbon footprint