Spotted Crake "whiplash" call at Reydon Smere

On Friday 29th April I heard the Spotted Crake'whiplash' call heard almost as soon as I arrived (a first for me) at 8.45pm calling at Reydon Smere marshes between 8.45-9.05pm along the Cove Bottom rd by obvious large double gate by bend TM498792. It called around 5X then a pause then another5X around 8.45-8.49pm then a pause at 9pm started calling more regularly. From the double gate the velocity of the "whiplash" call was strong and strident.