I would expect the respective lawyers to advise settling before it went to tribunal.
In RL Loxley Hall must have employers' liability insurance and this would foot the bill for the legal expenses in the event of a claim by an employee and the insurance company would go for a settlement rather than going all the way to a tribunal because it is cheaper than fighting the case. LH would have to pay the settlement figure though and this would be sizeable.
The employee, if not in a union, would probably engage a lawyer on a no-win-no-fee basis and, again, a settlement figure would be a more certain return than a tribunal hearing.
On other words, I expect this to cost LH money but Lizzie might manage to keep it quiet if she agrees to a settlement. (I'm guessing somewhere in the region of a year's salary for Roy and Hayley as a minimum figure.)
Any claim by an employeee will greatly increase Loxley Hall's insurance premiums for many years to come so if Roy is out for revenge, and he seems to be, then he is likely to get it.
Freddie could ask questions about mismanagement of his estate when he comes into his inheritance because it is going to be many thousands less than it should be.
Now THAT could be interesting.......