I missed most of the TV programme but I saw a definitely alive Alan Pringle whom I believe was involved.
The Valiant systems were mainly electrical and DC at that. The undercarriage legs had individual large electric motors for normal raise and lower plus smaller ones for emergency lower. This did not normally cause any problems however, on one particular sortie, it nearly resulted in the loss of an aircraft. Ted Longdon and his crew were recovering to Marham and selected undercarriage down, all was fine until the legs got fully down when a short across the selector caused the legs to retract again. Because each leg was independently powered the legs got completely out of sequence shaking the aircraft violently to the point were it seemed the aircraft might break up. Finally the crew managed to catch an instant when all three lights were green and the AEO tripped a vital fuse. A very pale faced crew returned to the squadron, somewhat shaken in every sense.