 Its value was marred in the amateur era by periods when the elite clubs like North, Instonians and Collegians withdrew from the league to allow them to fulfil more friendly fixtures - particularly against English and Welsh opposition.This attitude from some of the senior clubs even lead to the scrapping of the league in 1930, and it was not re-established until after World War II.The practice of withdrawing from the league finally died out in the 1970s.