BBC: The prime minister will say in his podcast: “Never again should we face the deadlock that threatened to pull down these talks. “Never again should we let a global deal to move towards a greener future be held to ransom by only a handful of countries.” He said lessons must be learned from the “tough negotiations” that took place in Copenhagen. Ahead of the podcast being placed on the Downing Street website Mr Brown used a video link from his Kirkcaldy constituency to tell …