Books:
How to use colour effectively in the garden and some good plant combinations:

Christopher Lloyd Colour for Adventurous Gardeners (BBC books)
Sarah Raven The Bold and Brilliant Garden (Frances Lincoln)

My two favourite books on garden design:

John Brookes Garden Design (DK)
Piet Oudolf with Noel Kingsbury Designing with Plants (Conran Octopus)

Good, general books and gardening diaries:

Beth Chatto Woodland Garden (Cassell)
Monty Don The Ivington Diaries (Bloomsbury)
Christopher Lloyd Garden Flowers (Domino)
Christopher Lloyd In My Garden ((Bloomsbsury)

Websites:

Royal Horticultural Society:
www.rhs.org.uk

The National Garden Scheme gardens open for charity:
www.ngs.org.uk

Woottens plant nursery at Wenhaston near to Southwold:
woottensplants@btconnect.com

Wiggly wigglers:
http://www.wigglywigglers.co.uk/