Thanks for your question, Derek. I am a solicitor in Scotland. I understand from what you say that you are not employed by this company, that you were a contractor and that you were being paid on a fee basis. That being the case, in the absence of a contractual provision to the contrary, you hold the copyright in your materials. The only grey area would be if they have paid you for these documents as part of the contract. Happy to discuss further. I hope that helps. Please leave a positive rating so that I am credited for my time.
A contract as producer of an event is just that. They aren't entitled to your working papers or anything else.
Reading that in isolation. Advice and guidance doesn't extend to providing paperwork. Unless there is anything in writing by way of an exit agreement