UK based - employer invented clause in contract to get me to pay back bonus because I am leaving! So, In December Boss gave me £500 bonus to spend as I worked so hard - handed in my notice 2 months ago (had to give 3 months notice) boss tried to get me to stay for a few weeks - when she found out I wasn't interested in staying she said that all bonuses where pay backable within 6 months if we leave and that this clause exists in my contract. Checked my contract - it doesn't - what could I do?