DIVER is Britain's no.1 diving magazine, outselling all its competitors put together, at bookstalls and by direct subscription. It covers every aspect of the sport, especially in the realms of gear testing and surveys, diving holiday destinations, and advances in technology and techniques.
http://www.divernet.com

BSAC stands for British Sub Aqua Club, the world's biggest diving club. It was formed to promote underwater sport, exploration, science and safety to the highest standards and you can learn to dive with the BSAC, or you can continue your training if you have started with another organisation.
http://www.bsac.com

Deeper blue is an international independent online magazine for divers. Offers editorials, feature articles, tips, discussion forums, and more. Good travel section, scuba diving equipment and discount scuba gear store.
http://www.deeperblue.net/cats.php/3

Aqua Lung is the name that first introduced the world to Scuba diving more than 60 years ago when Jacques-Yves Cousteau and Emille Gagnan developed the first "Aqua-Lung." Aqua Lung's growth over the last 60 years has continued with the acquisition of several leading companies that share our excitement and innovative spirit. Aqua Lung international includes the best brands in aquatic equipment.
http://www.aqualung.co.uk

We offer International recognition for our members, both with SAA qualifications and with CMAS qualifications. We are the only CMAS qualification issuing authority in the UK. We have the strength of an Association to support and protect our members and we offer third party insurance, personal accident insurance, equipment insurance and preferential rates with car hire firms and breakdown recovery clubs.
http://www.saa.org.uk