Carers Oxfordshire
The Carers Oxfordshire website (http://www.carersoxfordshire.org.uk/cms/) provides a wealth of information about what is available for carers, for example the (free) Emergency Carers Support Service and information about benefits and grants.
The dedicated page for Henley (http://www.carersoxfordshire.org.uk/cms/content/henley-thames) lists the support groups that meet in Henley.