If you are a party in a chain your ability to complete the sale or purchase is dependent on parties to the ‘Chain’ other than yourself. For instance, if you are a first time buyer buying from a seller who has maybe inherited the property and does not ordinarily live there, there is no chain as neither party are affected by anybody else’s ability to move into another property being sold or purchased. If you have a house to sell and you have to sell it to finance the purchase of your next property, the owners of which could also be depending on your purchase to be able to move into their next property, then you are in a chain along with every other party who may be a buyer or seller of any component of the associated linked house transactions. It only takes one party to pull out to frustrate all parties from being able to complete on planned completion day. This is referred to as a break in the chain.