The cost of buying the GB perfin identity catalog sections is a very big investment... probably running into hundreds of pounds. Second hand sections or catalogs are nearly as expensive... however...
The Perfin Society auction lists are available online. There are quite a few auction PDFs and they contain valuable information on perfin type, dates, identities, stamps used etc.
If you are prepared to work at it, you can create your own database of GB perfins.

Most auction lists contain several hundred identified perfins such as listed above. The only thing missing would be the pin count but that is not a hindrance to identifying many perfins.
So far I have downloaded
28 PDFs each containing several hundred identified perfins and am in the process of making a sectional list.