pp00ne no.4: PN said "after 1968". No Yellow Sun Mk.2s were allocated to Wittering. The Sqdns were nominally formed 1/5/62 (100) and 1/2/62 (139) and were effective on Blue Steel early-1964 (100) and 24/10/63 (that's all as per Wynn's Official History. B.2s available to Wittering 1962-63 before those Blue Steel dates were rolled back into HP Radlett to be brought up to (then described as "Autoland mod") standard.