 In case of failure to keep this agreement, the priory was to pay to the abbot or his successors a fine of £10, levied from its manors of Layer de la Haye, Peldon and Abberton.Although not as wealthy as its rival, St John's Abbey, St Botolph's did own considerable holdings in Essex and southern and eastern England.An early source of income was from the tithes of the demesne of Hatfield, granted to the Priory by Henry I from his own personal estates.