Here in Scotland we can apply for a blue badge for Mental Health Issues, including Dementia. Just got one for OH last month and finding it a great help, when shopping or going for e.g. optician's appointments. OH now shuffles when he walks and has no idea of directions, so the ability to park near the door is a big help. Also he is happy to sit in the car by himself if I am just popping in to collect or deliver something because he can see where I am.