An informative article on the laws in Germany and the United Kingdom as they give effect to the EEC Counsel Directive 86/653/EEC can be found in the following publication:
Julian Roberts (barrister),"Agents and Compensation", New Law Journal, 31 march 1995, pages 453-455.
Also available from the publisher:
Butterworths Halsbury House 35 Chancery Lane London WC2A 1EL