Viewed from Hatfield we regarded the 748 as having the field performance criteria we needed for our 146 and it set us a target for seat-mile costs. The ATP (Ancient Technology Preserved) seemed to us to offer no advantage over anything.
Moving the ATP production to Prestwick was part of the property-value-led shambles that closed a purpose-built production building at Hatfield and moved its 146 final assembly to add it to that being undertaken in the building at Woodford which was originally built for production of the Avro Manchester.