Links you may find usefull

Deshok.com website design:
http://www.deshok.com

Direct.gov, advise on invasive plants:
http://beplantwise.direct.gov.uk

Environment agency pond info:
http://www.environment agency.gov.uk

RSPB, pond page with useful info links for pond life info:
http://www.rspb.org.uk

RSPB, heron deterrent advice:
http://www.rspb.org.uk