I have been threatened with termination for declining to do work that I do not normally perform. I am a tradesman and have been with the company nearly 20 years. I am mostly on my feet but the work they want me to now do requires a great deal of time sitting. I have a pre-existing neck condition that occurred at work in 2009 and for which I was treated for by the company health centre. I cannot sit upright for long durations as this compresses my neck and leads to numbness in my arms and hands and a stabbing pain between my shoulder blades. Am I within my rights to decline this work and if terminated would I have a case for wrongful dismissal?