This thesis is concerned with the characterisation and modification of a group of pyrrole based conducting polymers. The monomers were fabricated, and upon electrochemical growth, the electronically conducting polymers were characterised using a number of techniques in order to study the chemical and physical structure of the polymer films. Subsequently, a method of surface modification (derivatisation) was developed, optimised and characterised. To optimise the characteristion and derivatisation methods before application to this group of polymers, a study of UV photo-induced grafting was undertaken upon a well-defined system. The photografting of acetic acid and a maleic anhydride/styrene co-polymer to a poly(ethylene) surface and the subsequent derivatisation of the surface polymer chains was successfully optimised and characterised for each system.