No flexibility in arrival/departure times. Used pre-booking to park at Piccadilly Place, Manchester, staying in nearby hotel. Arrived 28 minutes early, but also left an hour early the following day. Was charged £3.50 extra for this "overstay" (that was actually 29 minutes understay). Might not seem a lot, but represents 30% on top of pre-booking cost for 22 hours' parking.
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