what kind of work are they doing on the land, if the deal collapses you could be held liable for the cost of the work as it is still your land, I would have my worries about the neighbour, it doesn't take 6 months to get your finaces organised, also be careful that they are not making money from the land while it is still yours...if it does collapse, then they have made money and you'll incur loss, get your solicitor to write stating that you want the deal closed within the next 4 weeks and that all work on the land is to stop, until contracts are signed and loan approval has been got...i know you said that you know them on a personal level, but they seem to be taking you for a ride...hope it works out