I have the following licences: dogman and self-erector crane licence. My employer has asked my project manager and site manager if I would go and operate a hammerhead crane for which I don't have a licence on another site to help to move a backlog of materials off the road and onto the site, as their usual operator had been sacked. I obliged and very reluctantly explained that I didn't have the correct licence and that what I was doing is probably illegal? They have since asked me to perform these duties again indirectly through site managers and project managers and I have reluctantly obliged again as I feel I have to against my better judgement. I believe that what I am doing is illegal without the correct licence in place and that I am being pressured into doing this for fear that it would jeopardise my position or job. Under Employment Law, can I just refuse to carry out these demands from my company as I feel my licences are at risk?