I used to have this book - probably still got it somewhere...
Some very interesting artwork, and none of it influenced by drug-use, no siree, not here!
I particularly like the Janis Joplin / Big Brother & The Holding Company cover
Ahh! It's okay - I've found them:
Wikipedia
Klesh - formed in Slough in 1977, known for singles:
This is Radio Klesh;
Complete Klesh;
Klesh Opportunities;
Kleshdown;
And Klesh City Rockers.
These are the original Westone knobs - 20mm dia, approx. 12mm high. Knurled edges, flat top, grub screw. Pretty sure made from solid brass, tho I can check this tomorrow.
The bass for sale is lovely