Thanks for your response as this is exactly the type of information I need, the barriers you encounter whilst working are just as important as the ones you find when applying for work.
I've encountered many barriers as my tremors have got worse, I have even got letters from Consultants to say I'm not a alcoholic because people have used my disability against me for their own gain, I can't put into words how this has affected my confidence over the years.
I'm looking to do something with the DWP as there is a window of opportunity, contacting Employers will be a part of that process of putting a scheme together, if we know the pitfalls you can explain them to the employer. Your idea for a questionnaire is a good one so if you'd like to offer some questions that I could ask it would be appreciated.
I did ask Parkinson's for assistance and they directed me to this forum as a means of a resource, hope more will come forward with ideas... as with most problems you have to find the solution, we can all but try.