“35. I therefore concluded that the claims had to fail. In fact, I concluded also that the claimant could not in the circumstances reasonably believe that there was a risk to the health and safety of any employee, including him, arising from the circumstances which actually existed at the respondent’s workshop on the21st November 2017 . In addition, I concluded that there were not on22 November 2017 “circumstances of danger which [the claimant] reasonably believed to be serious and imminent and which he could not reasonably have been expected to avert” in the part of the workshop to which Mr Solomon had required him to go and work. That was because I concluded that it was not reasonable for the claimant to believe that his workplace was not safe because its dust extraction arrangements were to any extent inadequate.”