Bells will ring at St Wulfram's in Grantham to mark Mallard anniversary Grantham Journal At 11am, 11 bell-ringers will mark the 75th anniversary of the Mallard's world speed record by ringing three quarter peals, each lasting 50-55 minutes and consisting of 1,344 changes. In total, 4,032 changes will be rung during the course of the day ... See all stories on this topic »