Do your own research into employment law and keep notes. Once your employer realize you can quote multiple specific cases and run rings around them, they will soon be wanting to settle out of court.
Stupid suggestion.
Trying to be your own DIY hotshot lawyer based on what you read in some books is bad enough.
Doing so with employment law is asking for trouble and you are only going to embarrass yourself.
Employment law is incredibly complex and ever changing, especially as in this instance we are talking about UK/EU employment law, which is probably some of the most complex in the world !
When dealing with employment law, there is absolutely no choice but to employ the services of a good lawyer with a specialism in employment law and let them get on with the work. Not only will they be able to recite all the case law off the top of their head, but they will also have extensive
real world experience.... stuff that you won't find in your library text books.