Societies etc.
American Orchid Society - http://www.aos.org
British Orchid Council - http://www.british-orchid-council.info/
British Paphiopedilum Society - http://www.paphiopedilum.org.uk/
Central Orchid Society - http://web.mac.com/johnspires/Site/Central_Orchid_Society.html
Cheshire & North Wales Orchid Society - http://www.canwos.org/
CITES - http://www.cites.org/
East Midlands Orchid Society - http://www.emos.x10hosting.com/
Fenland Orchid Society - http://www.fenland-os.org.uk/index_files/Page358.htm
Friends of Sheffield Botanical Gardens - http://www.fobssheffield.co.uk 
International Phalaenopsis Alliance - http://www.phalaenopsis.org.uk/ 
Lincoln Orchid Group - http://log-on.org.uk/
North of England Orchid Society - http://www.orchid.org.uk/ 
North East of England Orchid Society – http://www.ne-orchids.org.uk
Orchid Conservation international - http://orchidconservation.org/
Orchid Society of Great Britain - http://www.orchid-society-gb.org.uk/NewSiteDevelopments/index.php
Orchid Species encyclopaedia - http://www.orchidspecies.com/indexco.htm
Peterborough International Orchid Show - http://www.peterboroughinternationalorchidshow.org.uk/
Pleione website - http://www.pleione.info/
Restrepia National Collection - http://www.restrepia.co.uk/
Royal Botanical Gardens Kew World Checklist of Monocotyledons -
                                     http://apps.kew.org/wcsp/prepareChecklist.do?checklist=monocots%40%40275011020082001934
Royal Horticultural Society - http://www.rhs.org.uk
Royal Horticultural Society International Orchid Register (parentage and grex name searches) -
                                                                                               http://apps.rhs.org.uk/horticulturaldatabase/orchidregister/
Slipper Orchid Alliance - http://www.slipperorchid.org
Suffolk Orchid Society - http://www.suffolkorchid.co.uk/
Writhlington School Orchid Project - http://wsbeorchids.org.uk/
 
Dealers
Akerne - http://www.akerne-orchids.com/botanical.htm
British Orchid Growers' Association - http://www.boga.org.uk/
Burnhams Nurseries - http://www.orchids.uk.com/shop.htm
Equatorial Plants - http://www.equatorialplants.com/
McBeans Orchids - http://www.mcbeansorchids.co.uk/
Orchid Accessories - http://www.orchidaccessories.co.uk/catalog/
Plants Plus (Accessories) - http://www.plantsplus.org/
Dave Parkinson Plants - http://www.daveparkinsonplants.co.uk/
Orchids by Peter White - http://www.orchidsbypeterwhite.co.uk/
Ratcliffe Orchids - http://ratcliffeorchids.co.uk/default.aspx
Heritage Orchids - http://www.heritageorchids.co.uk/
Roelke Orchideen - http://www.roellke-orchideen.de/
Orchid Alchemy - http://www.orchidalchemy.com