another one that's nice but requires deep pockets

[JonE]

Ian's comments also prompt me to say this is why, because the survivors register has a preponderance of UK registrations, the original registration is a key determinant i.e. retaining in its own data field just like chassis number, as they have a date-related aspect to them for research. When they are pushed into a separate field by a newer, current registration plate (which could have all sorts of reasons), it all gets more confusing and less valuable.