Plumbstock shall not accept on return for credit any goods ordered from Plumbstock incorrectly or subsequently found to be surplus to the customer’s requirements. The suitability of specialist goods is assumed to have been assessed by the customer or his/her advisor(s) prior to purchase. Plumbstock shall endeavour to assist customers where possible by accepting at a reasonable restocking charge the return of goods (together with the original packing if applicable) which are from Plumbstock normal stock lines but goods ordered from the manufacturer cannot be accepted without Plumbstock prior agreement for the return and Plumbstock restocking charges having been paid. Plumbstock cannot however accept return of cement, lime or plaster. In any event credit cannot be given unless the customer provides Plumbstock with the number of the invoice on which the goods were supplied.