I think 60133 Pommern was based at 56C from 1950 to 1963. 60148 Aboyeur was
there from 1959 to 1963. Also :
60115 - 1962 only
60117 Bois Roussel 1950-1951- & 1955-1963
60118 Archibald Sturrock 1950-1962
60120 Kittiwake 1950-1962
60123 HA Ivatt 1950 & 1959-1962
60131 Osprey 1955-962
60134 Foxhunter 1950-1962
60135 Madge Wildfire 1962 only
60141 Abbotsford - 1950-1962
60145 St. Mungo - 1962 only
Hopes this, unfortunately I don't know which ones are Darlington A1s.