Doing a cover version is a tricky job, with the amount of creative effort required to make it work frequently outstripping the potential rewards. But sometimes, just sometimes, the elements lock into place, and the planets align, and we’re taken to a higher level of consciousness. The BBC have been running a campaign to find the best cover versions of all time, and the Flaming Lips have just unleashed their song by song reworking of Sgt Pepper’s Lonely Hearts Club Band, but what about the ones that slipped through the cracks? This list might not be the best covers in the…