Subsequently, he was attached to the Spanish Chapel, Manchester Square, London, where he obtained great celebrity as a preacher.
[1] By the publication of his Liturgy and his sermons "in defence of the ancient faith" he incurred the displeasure of his ecclesiastical superior, Bishop Poynter, who suspended him and denounced his works.
The Sacred Congregation of Propaganda, wishing to terminate the controversy, by letters dated 1 March 1817, required that Gandolphy should be restored to the possession of his former missionary faculties on apologising to Bishop Poynter for whatever might have been disrespectfully stated by him in an address to the public hastily printed some months previously, and of which the bishop had complained to the holy see.
In 1818 he resigned his chaplaincy at Spanish Place, and retiring to the residence of his relatives at East Sheen, died there on 9 July 1821.
George Oliver says that Gandolphy "wrote too rapidly not to err against theological precision," but John Milner remarks that there was "no heterodox or dangerous principle in his mind."