As well as his chancery duties, Neville occasionally sat with the barons of the exchequer or with royal justices, and he had a role in the appointment of royal justices. In 1230 he was regent of England while Henry was absent in France, during which time he met with Llywelyn the Great in an unsuccessful attempt to negotiate an agreement that would resolve the disputes between the English and the Welsh. In 1232, during the events surrounding the de Burgh's downfall Neville, along with Ranulf, the Earl of Chester, urged that de Burgh should not be dragged from sanctuary to face the royal accusations against him. Neville's pleas prevailed for a time, but eventually de Burgh was removed from sanctuary.