Few days before signing exchange of contract, the buyer sent their electrician to check out the electricity which was all fine but few things needs to replace such as new sockets (they still are in very good condition) worth £250 for the work and labour. Now the buyer is demanding that we have to pay £250 to do the work before they sign exchange contracts. I would rather to spend £250 on our new house which don't have any heating and electricity. Our flat is in very hot market. They didn't ask if I can do it but they told me to do it. Do I have right to say no?