lego released four main sets in 2011. diagon alley was released in january, while the other three sets were released on june 1, 2011, around the time of the cinema release of harry potter and the deathly hallows - part 2. however, the trolley, the lab and the mini hogwarts express were all promotional sets that were released in different countries at different times, which were either being given away with newspaper offers, the purchase of diagon alley from the lego shop and also with the pre-order of the game, lego harry potter: years 5-7.