Bluetop....big difference between would not and COULD not. In ryanair once you leave the dublin area their is no way to contact them, no hf on aircraft, no company mobile phone on the aircraft. They were told to contact dublin ops as the dispatcher gave them the load sheet and were about to close. At some point between push back and airborne the sent a message via serviceair at gatwick to say the COULD not do extra sectors, because in his professional opinion he was fatigued and it could compromise air safety.