The British Association for the Study of Headache (BASH) is the UK arm of the International Headache Society (IHS), and an organisation focused on relieving the effects of migraine across the UK. Its membership is open to anyone with a professional interest in headache and the organisation works to raise the profile of headache and its surrounding issues.
BASH has produced guidelines to help doctors in the diagnosis and management of common headache disorders. The guidelines are updated every three years.
You can download the latest guidelines here: http://www.bash.org.uk/guidelines/