The British Library Integrated Catalogue
Access 
The entire reference data and search result details can be displayed and retrieved for free. Also provided are some personalized options in case of multiple or recurrent searches. Plenty of internal and external links are available.
Fee Policy 
Users can search the catalogue free of charge, but for ordering copies of many items they have to pay by credit card. Also, to search and order items for remote delivery (for a fee), or to reserve any material, users need to apply and then register and log-in
Free Retrieved Material
While reference data and search result details are easily retrieved, other areas require some institution affiliation.
Linking Richness
Along with internal links to locate reference material and further pages related to any search results, the site points to further resources located only within the British Library main website