Kenneth Wheeler 1

I have considerable experience of flying as a flying instructor (Civil and RAF) and I've been flying RC helicopters for 7 or 8 years. I'd like to run an aerial photography business and would like to obtain CAA certification. Can I sit the necessary tests (preferably on-line) in order to obtain the certificate. Clearly, I have passed all the necessary exams related to civil flying in order to get my commercial pilots' licence (air law; meteorology; principles of flight; etc). All advice gratefully received.