I have wondered why the 1950's idea of linked squadrons to preserve traditions etc. wasn't revived. 19 was linked to 152 between 1940 and '54. Obvious pairing that come to mind include 5/11, 15/16, 19/92, 22/202, 43/111, and 55/57, or even 23/56/74. Until the 1990s ther were plenty of double number army regiments particularly cavalry e.g 16th/5th Lancers and the 17th/21st Lancers.