Locum work as GP throughout the UK

Hallo may anybody be so kind as to explain how the GMC changes ( licence to practice ) may effectively alter locum work in the UK. I have been working as a GP in Germany since 1990 and hold the GMC certificate as a GP listener since 2007. Unfortunately I did not happen to work as locum so far. Agencies seem of quite the same quality as they are europewide. Now as everybody who is stuck knows the GMC raises the fees substantially and I wonder whether to check out. On the other hand I still be interested to do locums as a GP if there would be any convenient possibility. Still the main hurdle to cross is the PCT listening which seems not be easily done. Perhaps some friendly minds put me forward to continue to look out for locums or to resign. Paul