See Castle Street East 1 to 15 &c in London Addresses dataset
No 14 Castle St East Land Tax 1791-1796 John Carroll (QV*)1798-1800 Letitia Turnbull
Robert Turnbull bach of St Martin i t Fields aged 22 plus (?) a minor with consent of his mother Hellien Turnbull lic 16.11.1771 to marry Sarah Bristow sp aged 24 plus / Robert Turnbull wid otp = 30.3.1782 St Marylebone by lic Letitia Carrol sp otp wit Elena Lay / Letitia d of Robert & Letitia Turnbull bapt 2.2.1787 St James Piccadilly / Robert Turnbull of St Marylebone bur St Giles i t Fields 8.2.1795 / Letitia Turnbull of Shadwell bur 7.1.1809 St Giles i t Fields. See Carroll. John for their baptisms at Shadwell