2 Nolan Porter classics on one 45. ‘If I Could Only Be Sure’ has seen many a man weep on the dancefloor. Massively sought after, the original pressings of this soul classic from 1971-72 can fetch up to £400. If that’s not enough, the driving ‘Keep On Keeping On’ from 1971 is a more northern hip grinder that goes for £50 on it’s original Lizard Records pressing. Essential.