Perhaps if you were not fully conversant with the working I could fill you in. If the 1716 Loco Hauled Premier Set doesn't operate as scheduled then the 0534 can not operate with normal formation the next morning. If the LHCS is not available it is usually operated by a Class 175 without First Class and full catering but with just a trolley service provided. Tonight, though there was no DMU available to cover it