Delivery dates, given in good faith, are approximate and reflect conditions prevailing at that time. We shall not be liable to the purchaser or be deemed to be in breach of the contract by reason of any delay in performing, or any failure to perform any of our obligations in relation to the goods, if the delay or failure was due to any cause beyond our reasonable control. Without prejudice to the generality of the foregoing, the following shall be regarded as causes beyond our reasonable control namely difficulties in obtaining materials, labour, fuel, parts or machinery, power failure or breakdown in machinery.