These are some Organizations you might find useful....

• NSALG - the National Society of Allotment and Leisure Gardeners
• Leeds City Council Allotments Page
• RHS - The Royal Horticultural Society
• HDRA - The Henry Doubleday Research Association
• ARI - The Allotments Regeneration Initiative

And some suppliers....

• Kings Seeds - the NSALG seed scheme suppliers.
• D T Brown - a major seed company
• Codnor Horticultural Supplies
  Cherry Tree Cottage Farm
  210 Peasehill,
  RIPLEY, Derbyshire, DE5 3JQ
  01773 742847
  [no website or email]

And local allotments information and sites....

• Get yourself an allotment in Leeds - A very useful site this one!!.
• Growing vegetables on an allotment - This site is a virtual encyclopaedia of allotmenting information [inc. monthly jobs, seed sowing and harvesting charts, pests and diseases and, most vital to newcomers, getting started!]
• Burley Model Allotments - An allotment site on the border of LS4 and LS6