I'm in the process of buying a new build. My conveyancer has sent several enquiries on the purchase and it has been established that some of the pre-commencement and pre-occupancy planning conditions have not yet been discharged. A couple have not even been submitted. My conveyancer is concerned about this and from what I have learnt so far this appears to be a valid concern. The developers say that it's just the way it is and we shouldn't worry as not all planning conditions will be met until the development is complete. They are now threatening to cancel the sale and have set a deadline for the contract to be returned. We are in a chain and everyone was expecting to be exchanging in the next couple of weeks. People are already occupying properties on the development, is it common practice for some pre-commencement and pre-occuonacy conditions to not be discharged prior to work starting and people already occupying properties or should I be thanking my lucky stars that I have a good conveyancer who picked up on this?