Nigel. Neither Cameron not anyone could have immediately triggered article 50 as the court case proved. It had to be put to parliament and follow due parliamentary process. Quite right too. I would have thought that you as a brexiteer would be all for giving the UK government control!

But that was what I understood was to have happened. David Cameron's statement in Parliament: Prime Minister David Cameron yesterday set out the details of the UK-EU deal in the House of Commons. He argued that the referendum would be “a straight democratic decision… Having a second renegotiation followed by a second referendum is not on the ballot paper.” He went on to say that “If the British people vote to leave, there is only one way to bring that about, namely to trigger article 50 of the treaties and begin the process of exit, and the British people would rightly expect that to start straight away.” (from Here)
The court case didn't prove that Cameron would have been unable to do it. He would not have been bound by a court case which hadn't happened. It was only the delay in the process which allowed someone to bring that forward with an attempt to thwart Brexit.