Hi,
page 216 of this level 4 handbook lists methods of professional development as colleges, training providers, courses run by the local council, Early Years advisors, Children's centre training.
There is also your Local Safeguarding Children's Board, inhouse training, short courses run by charities such as the NSPCC, St. John's Ambulance, NCB, Play England
Sources for professional development include sector specific magazines, regular checking of websites, lirbrary and experitise sought from other professionals.
Hth xx