This is the Main Amphetlabs Soundhead lo-fi system. Fuzz.
Manufactured in South Yorkshire by D*A*M.
Essentially this is a copy of Robert Hampson's (from Loop) Jumbo Tone Bender, which he used on all the Loop records.
Roberts original unit came with some factory "faults" which made it a real unique sounding Fuzz pedal. David Main recreated it for him so he could use it whilst touring and it also features on the new record.
New Loop Record