"... If we are wrong about that and for some reason the procedure was defective, then according to the principles in the Polkey case there was an unfair dismissal, but applying the principles in the Sillifant case (referred to in the Polkey decision), there was no chance whatsoever of the applicant retaining her employment as we are satisfied there was no system of working which the applicant could have proposed which would have been suitable for her and reasonable as far as the respondents were concerned."