The Flanders and Swann recordings are available in many forms -
of particular interest are 2 CD box sets which comprise all the available recordings, and a video.
The songbook appears to be out of print, but copies are readily available on the secondary market.

Flanders and Swann: THE COMPLETE

Flanders and Swann: HAT TRICK

Flanders and Swann (VIDEO)

The Songs of Michael Flanders & Donald Swann (BOOK)

The links given are to Amazon (US) - this is NOT an endorsement.
Their prices are frequently excessive, and their customer service abysmal.

Best wishes, Thomas.