You are absolutly right, the survey does lack rigour. I think the best way around this would perhaps be the use of a focus group and a more qualitative approach with the source of questions coming from a projective technique.
I have taken your advise and checked out Survey Monkey and it has proven to be a good resource for the design process, thank you.
When I conduct the more In-depth interviews with the focus groups, I will not start with any assumptions.
What do you think the options are for Diesel powerboat owners if the derogation is removed?
Thank you for your profesional advice and I will certainly take you up the offer of lending a helping hand