Haydock sometimes collaborated with former Douay associates. In one case Father Thomas Penswick (1772–1836), a former classmate, translated  The Love of Jesus in the Adorable Sacrament of the Altar (1801) from the French of Henry-Mary Boudon. (Ironically, Penswick, who later became Vicar Apostolic of the Northern District, would have a disagreement with Thomas’ brother George, resulting in the latter's temporary suspension from his priestly functions.)
Haydock occasionally worked alongside former Douay colleagues. In one instance, Father Thomas Penswick (1772–1836), a former classmate, translated  The Love of Jesus in the Adorable Sacrament of the Altar (1801) from the French of Henry-Mary Boudon. (Ironically, Penswick, who later became Vicar Apostolic of the Northern District, would have a disagreement with Thomas’ brother George, resulting in the latter's temporary suspension from his priestly functions.)