In 1964, Lines Bros. acquired Meccano, the parent company of Dinky Toys and, rather than support two brands simultaneously, the owners decided to discontinue Spot-On in favour of Dinky in 1967 (Rixon 2005, p. 38).
From this point on, Dinkys were usually made in 1:42 scale, though unlike Spot-On they were not consistent and continued to make both larger and smaller models to fit in with different market niches.