This site may be of interest. It currently has 80+ properties listed throughout Scotland, England and Wales, many of them Tourist Board inspected.
The site has a searchable database of holiday cottages allowing people to search for properties which meet their specific needs, especially useful for families, pet owners, disabled, outdoors lovers and groups. Bookings are made direct with the owners.
www.preferredplaces.co.uk
If you try one of their holiday cottages, let us know how you get on.