The following local organisations and links may be useful: 

Age UK (Oxfordshire)  (formerly Age Concern)
Dementiaweb Oxfordshire 
Guideposts Trust
Oxfordshire County Council (Occupational Therapy web-site section)

The following national organisations and links may be useful:

Age UK (formerly Age Concern) 
Alzheimer's Society 
Disabled Living Foundation 
Living Made Easy
 

We also have a large number of National Disability organisations listed in our Information area.