Not so far mentioned and a slightly surprising candidate is the Bristol RE/Northern Counties combination, just 11 all told.
One batch of 6: WMA113-5E, YLG716-8F (SHMD 113-118, later SELNEC/GMT 5073-8) and a batch of 5: LHG384-8H (BC&N 84-8, B&P same f/nos). These (5) all passed to independents...