I have a business which I own 50% of and can no longer get on with my business partner so have agreed to sell my half of the business to him for £25k. He has come back to me to say that he will give me £12,500 to sign my shares over to him and then a further £12,500 when the lease is signed over to him. The majority of the money we invested in the business was fixture and fitting and not the lease. I am not sure how to proceed as if he owns the business fully and decides not to purchase the lease later, I will lose out and will own a lease that is not really of any benefit. Please help!