Definitely try Citizens advice. Go to their website and get a phone number. I used them for a consumer problem. Quoted CAB and Cosumer Rights act 2015 and got everything sorted to my satisfaction. I know that they do a lot of employment law. Sometimes you will get some free time with an employment law speciaist who will take you on if it looks that they will make some money, and yes, I was an adviser with them some years ago.