Policy F
Spandex,
The company state that Policy F is non-contractual
The lawyers state that written policy becomes contractual if accepted by both parties over a period of time.
In short I think the issue at hand might be which is cheapest for the company - negotiating some kind of retraining programme/part time working compromise maybe even part subsidised by the employee or face the unknown quantity that is a large class action lawsuit with 150 people that could result in bad press, prolonged litigation and a significant compensation payment.