Rare is the crowd who whoop and holler the news that there will be “no hits” over the coming two hours, just “B-sides, album tracks and what we’re calling ‘fan favourites’.” Because rare is the band that can carry off such an affront to civilised entertainment. You could count them on the fingers of one hand after a major industrial accident: The Smiths, yes, Suede, yes, Oasis, yes, but… Pet Shop Boys?