By December 1413 Prestbury was sufficiently trusted by the new king to be commissioned with other eminent clerics for investigation and reform of St Mary's Church, Shrewsbury, a royal free chapel. Subsequently, the invasion of France in 1415 took many of the most violent men out of the region. The diplomatic prelude had been prolonged and perhaps prompted John Burley, a trusted lawyer in the service of Arundel and no longer young, to make preparations for his own death. On 1 December 1414, for a fine of £20, his agents were allowed to grant in mortmain substantial property at Alveley on the Severn. This was to fund a chantry for Burley himself and Julian, his wife, in the chapel of St Katharine at Shrewsbury Abbey. Arundel himself died of dysentery, contracted at the Siege of Harfleur and this may also account for Burley's death shortly afterwards.