See Castle Street East 1 to 15 &c in London Addresses dataset
15 Castle St East Land Tax 1784-1794 William Cross 1796-1802 John Poole 1804 Thomas Pool
Witness to will of John Fletcher (QV*) in 1787 cheesemonger of Castle St / Will London Consistory Court dated 29.10.1794 of William Cross who died October sworn under £2000 wife Elizabeth children Margaret, Elizabeth, Edward & Matilda exec Henry Hurle sr of Pentonville wits C Dawes, Jas Jeffcott / William Cross = 14.7.1772 St James Piccadilly Margaret Carter, Margaret d of Wm & Mgt Cross bapt 15.8.1773 there. Edward s of Wm & Eliz Cross born 22.12.1787 bapt 13.1.1788 St Marylebone Matilda d of Wm & Eliz Cross born 21.8.1791 bapt 18.9.1791 St Marylebone (Matilda became housekeeper to Duke of Wellington at Apsley House 1841 & 1851 censuses / William Cross bur 6.11.1794 St Marylebone. See Pool, Thomas for marriage shortly after his death of dau Margaret at which Henry Hurle was a witness. Note this Henry Hurle was very likely the first archdruid of the Ancient Order of Druids (see Ronald Hutton, Blood and Mistletoe)