In brief, I am organising an awards ceremony and a potential sponsor put forward someone from their company(radio) to mc on the night. I met her, approved it verbally and confirmed in an email we would use her. I asked them to draw up a detailed breakdown agreeing her duties on the night- along with some other info re their involvement-and them I would draw up a contract for both parties to sign. I asked more than once bit never received it. I have since had a better option and no longer want to use this woman. Am I bound to honour the original verbal/email agreement?