An apparatus for releasing a closure, comprising retaining means actuable between a retaining state in which it can retain the closure and a release state in which it ceases to retain the closure; the apparatus further comprises an actuator for actuating the retaining means between the retaining state and the release state; and a shock sensor for detecting shocks to the apparatus, the shock sensor being coupled to the actuator, wherein the actuator is configured to actuate the retaining means between the retaining state and the release state in response to a shock to the apparatus.