I am sorry to say, employment law is VERY much on the side of the employer-I know from personal experience that persuing your rightful claim is expensive-currently £195 per hour plus of course VAT--lose and you may face paying their costs also as well as your own. So I am afraid that unless you are either very rich or very principled, my advice is to think long and hard about taking the legal route--it can end in tears. Sorry to be the harbinger of doom--just my own experience of Employment Law.