LizzieL and jonwarrn: Where are you finding these entries for Thomas, Joannes and Patricius? In FindMyPast I can see a Thomas who is born in 1815, died on 22 Dec 1816 and was buried in Spitalfields Burial Ground. That's in Tower Hamlets on the other side of the Thames and you'd think if they lived in Southwark they'd bury him there. Not necessarily, but you'd think so. The information is from a burial index that doesn't give his parents' names. You have a specific birth/baptism date. There is a practice of giving child the name of a predeceased sibling, so another Thomas in 1821 could be
I knew about Honora, but not about the Patricius born a few weeks later. Both baptized in Catholic churches. That's a head-scratcher. Patricius is baptized in St. Mary Moorfields in the City, whereas Ann, Honora, Elizabeth and Thomas were baptized in Southwark. Mind you, Peter and Eleanor were apparently married in St. Magnus the Martyr in the City.
Amazing sleuthing. Now I wonder where Peter and Eleanor came from!