Jeg har ganske enkelt ikke kunne finde svaret på div. sites, men måske I kan hjælpe mig:

Hvornår indførtes det i det engelske, at en sejr i Liga Cuppen udløser en europæisk billet?

På forhånd tak.

Det har faktisk været sådan siden den blev stiftet i sæsonen 1960/61

kilde: wikipedia.org

During the late 1950s, the majority of senior English clubs equipped their grounds with floodlights. This opened up the opportunity to exploit weekday evenings throughout the winter. The League Cup was introduced in the 1960–61 season specifically as a mid-week floodlit tournament. In the early years of the competition, many of the top teams declined to take part. It was only when automatic entry to the UEFA Cup was promised to the winners that the full League membership took part.

In the last 10 years, following restructuring of European football, and the introduction of the restructured format of the UEFA Champions League, the League Cup was threatened with losing its UEFA Cup slot for its winners. It has retained it thus far however, and along with France is the only nation to offer a UEFA cup slot to its second cup competition winners. Therefore it retains enough importance and popularity, especially with fans of clubs for whom the League Cup offers a realistic chance of qualifying for Europe.

Ser vist ud til Hawk har ret 

Hvorfor fik jeg så ikke europæisk da jeg vandt den med QPR i mit manager-game?! ÆV!

Men ja, det er vel grunden til dens stadige popularitet - fjerner de først det europæiske mandat, så ryger interessen.