G-BAAA Pink
G-BAAB Yellow.
The Court Line One-elevens were three shades of Pink, Yellow, Green or Purple and all the aircraft in the fleet were named Halcyon ... (Days, Dream, Dawn, etc.
I spent many an early morning turning-round One-Elevens - our record in 1972 for a full clean, de-cater, re-cater, refuel, pax off and on was 29 mins!