UK National Archives
Access 
Access to the website is open to the public, with a free registration for personalized services. Content can be partly viewed and retrieved for free, other documents require a fee. Plenty of internal and external links are provided in each webpage.
Fee Policy 
Access to the entire site is free and open to the public. A free registration enables personalized services and options. Downloading of some records requires a fee (only available through commercial companies) while documents higlighted in exhibitions and the releases section of the website are free to view
Free Retrieved Material
User can access documents both in the internal sections and in the reference catalogs. Some items provided by commercial companies require a fee to be downloaded and viewed
Linking Richness
Along with specific external resources organized in a special page, plenty of links are provided in each page