List all shipments that contained Building Materials, arrived in London and had either Cliff Walker or John Smith as the captain

Relationships for shoretoshore ship no SHIP NO SHIPMENT_DATE ORIGIN grade ufacturer id ARRIVAL DATE manufacturer Manufacturer ID Name SHIPMENT ID ITEM NO QUANTITY DESTINATION DAYS Bid Preference item no type weight Relationships for shoretoshore ship no SHIP NO SHIPMENT_DATE ORIGIN grade ufacturer id ARRIVAL DATE manufacturer Manufacturer ID Name SHIPMENT ID ITEM NO QUANTITY DESTINATION DAYS Bid Preference item no type weight