A considerable amount of land is acquired by local authorities and other authorities as a result of negotiation, but with the vendor having the knowledge that there are compulsory powers in the background. A local authority will buy the land, but they know that they can serve a compulsory acquisition order. What is the position where the negotiations take place in a friendly atmosphere, but with the definite knowledge that, if they are not concluded, then a compulsory acquisition order will be served?