Biff was a well known and much missed member of the following clubs: Axbridge Caving Group , Bracknell District Caving Club and Mendip Caving  Group. 

Biff is famous for his engineering skills!

Biff's work on Stainsbury?s Shaft at Charterhouse:
http://mendipcavinggroup.org.uk/jalbum/stainsbys070908biff/album/index.html

and Coral Cave, Compton Bishop:
https://ukcaving.com/board/index.php?topic=3485.msg47867#msg47867

Biff has helped in opening up the following caves:  Carcass Cave, Shute Shelf Cavern, Upper Canada Cave, Well Shaft Cave, May Tree and Primrose Caves linked to Upper Canada Cave. 

On Facebook:
https://www.facebook.com/biff.frith

There is a fine obituary in:
Descent (258) October/November 2017  page 11.  Farewell Lewis `Biff? Frith.