Please help me to correct!

I need to public this and it's very important but it needs to be correct so I am beging you for help! :(

I would like to ask some questions about the contract law in the UK. I don't know the legal system of the UK (common law) so I had a lot of problems to find an answer to my questions and that is why I'd be really grateful for your help. Short about the case. There war a contract between two businessmen: A (a seller) was obligated to deliver goods and B (a buyer) was obligated to pay the price. B paid only half price so A sued him for payment. B contends that he didn't pay the whole price because the goods were damaged. My questions are: In which legal act can I find informations about warranties in the sale of goods (between businessmens!)? What kind of goods does this warranty concern? How much time does B have to inform A about damages? and to sue A for warranty? Is there a possibility that B would plead the set-off in that case? I red that such a defende doesn't apply to cases in which damages were claimes but I couldn't find any legal basis. Which characteristic of a claim are requaired for the ser-off? In which legal act can I find some informations about set-off? Thank you for your help.


Thank you for the correction!