I have just found a copy of famous british referee Eugene Hendersons book. He gives his professional boxing record as followes:
George Willis lost rsc 8 Waverly Marked, Edinburgh
Bob Coyle draw 15. Edinburgh
Albert Johnson. Won points 15. St. Marys Hall, edinburgh
Billy Bird. Lost rsc 7. Blackfriars, London
Hans Kruppel. Lost ko2. St. Marys Hall, Edinburgh. - could be Franz Krueppel he boxed in UK at that time
Jim Cater. Lost point 15. Marine Gardens, Portobello, Edinburgh
Best wishes
Søren