The Sleep Apnoea Trust Association (SATA) is the leading UK charity working in the field of sleep apnoea working to improve the lives of patients and their families: www.sleep-apnoea-trust.org
OSA information, signs, symptoms and impacts of the disorder: www.OSAUK.org
Check out the ResMed's Mask selection.
Look at ResMed's Flow Generators.
HealthySleep may also be helpful.
NICE (National Institute for Health and Clinical Excellence) is an independent organisation responsible for providing national guidance on promoting good health and preventing and treating ill health.