Nearly complete list, as far as I know now.
Jach Atherton 1949, 53
Robby Baron 1976-77
Bearcat Brown (Bull Pratt) 1988
Wayne Bridges 1970
Robby Brookside 1997
George Burgess 1976, 86
Jack Cameron (as El Cameron) 1970-71
John „Rasputin“ Campbell (Hoy) 1967-68, 78, 81
Jan (Ian) Campbell 1969-71
Steve Casey 1981, 86, 94 (as Lord Steven Casey)
Stedman Clark 1970
Col. Brody 1984-86, 88, 90-91
Dan Collins 1988 (as Danny Boy), 95-96 (as Dirty Dan), 97 (Power Ranger one match)
John Cox 1967
John Crabtree (Daddy) 1972 (blilled from Ireland)
Ken Davies (not Tiffen) 1964
Ken Davies (Tiffen) 1950, 53
Bill Ellis 1960 (billed from Scottland no clue)
Barry Douglas 1969, 78, 80-81
Dynamite Smith (Hindley) 1991
Sam Evans 1971 (no information about him)
Dave „Fit“ Finlay 1988, 90-97
Jack (Al) Fontain 1965
Giant Haystacks 1984-86, 94
Mitchell Gill 1949-50
John Glenn (Glendening) 1976
Steve Haggetty 1975
Al Hayes 1957
Tug Holton 1968
Rasputin #2 1979 (as Al Howard), 85-86
Ron Johnson 1953
Juggler (Marty) Jones 1990 (only one match)
Sir Jeff Kay 1976-81 (also long time referee)
Killer Boy Davis (probably Roy Davis) 1961
Killer (Alf) Cadman 1954
King-Kong (Moram) 1970, 73
Bob Kirkwood 1975
Sam Kojak (Kirk) 1975-76, 78
John Kowalski 1972
Eric Leidermann 1971
Paul Luty 1969-70
Tommy Mann 1953-54
Drew McDonald 1988, 95-96
Mic McMichel 1995 (wrestled for two matches, long time referee)
James McTiffen (Gwyn Davis) 1963-64
Mercado Moses 1949 (billed from England no clue who this guy was)
Clark Miller (Steiger) 1962
Dave Morgan 1978-80, 82 (as Mexican Mask), 85 (as Mask) 88
Johnny Morgan 1957
Nasty Nicky Monroe 1994 (one match)
Terry O‘ Neill 1957
O.K. 1 Dennis Mitchell 1953-54, 56-57
O.K. 2 (maybe Geoff Portz or Ray Hunter) 53
O.K. Top (George Nuttal) 1954, 61 (as Charly Nuttal)
Chic Purvy 53 (only mentioned for one day)
Rex Regan 1953
Steve Regal 1992
Sean Regan 1967-68-, 71-72
Pat Roach 1967, 70, 73
Roland (Jack Rowlands) 1972
Nathan Rubinson (Alf Robinson) 1950, 52, 54, 60
Sailor Harris (Judd Harris) 1969-71, 81
Charlie „Big Boy“ Scott 1961
Lee Sharron 1969-71, 73-74
Jack Shirlow 1979
Johnny South 1987-88
Tina St. Clair 1994 (one Match)
Tony St. Clair 1987-88, 90-91, 94-97
Dave Starr 1954
Don Stedman 1961
Teddy Steel 1947-48 (billed from England no clue who this guy was)
Teddy Steele (Ray Steele) 1975-77
Bob Taylor 1964
Dave Taylor 1977-79, 82 (as Irish Mask), 84, 88, 90-91, 93
Eric Taylor 1954, 60
Jack Taylor 1960 (no clue)
Les Thornton 1967-68
Dave Valentine 1953
Tom Viking (David Cross) 1978, 83
Don Vines 1972
Billy War Eagle (Boston Blackie) 1988
Alex Wright 1993-94 (Son of Steve but born in Germany)
Bernie Wright 1987
Steve Wright 1982-91, 93
Josef Zaranoff 1969
Greetings from austria
Great information, thanks Gernot.