Certainly, MrHorgy.
It's in the JAA Aerodrome Operating Minimums (AOM), SERIES 600,
Jepp. text, Air Traffic Control Section,(between RNAV and "Regional Proceedures", and in my Jepp. text, it's page 603.
"DH for Cat 1 operations........
"DH must not be lower than........
"The OCH/OCL for the category of the aircraft.........
as Michael Caine says "not a lot of people know that" !!!
at last, a definitive answer....or does anyone have anything to add to it?