See Castle Street East 1 to 15 &c in London Addresses dataset
No 11 Berners St Land tax Mrs Sirs 1780 Elizabeth Brown 1782-1784 John Diolott 1791-1807 / SunFire 1793,1799 John Diolott gent / Harris's List 1793 Mrs Chish-lme
There was a person called John Dulotte who married Ann Wildman at St James Paddington 1.6.1791. John Dulot ran a book & circulating library in Brighton (UBDir 1791), and Eliz dau of John Dulot and Ann was bapt Brighton 3.1.1792, the will PCC of John Dulot of Tottenham Court Rd, St Pancras dated 13.2.1801 mentioned wife Ann, daus Harriot & Elizabeth (aged 10) and dau Charlotte excluded from will for misconduct (but he relented in codicil) execs Benjamin Tabart of Old Bond St bookseller and Henry Harrison Jones of Southampton St Holborn coal merchant proved 13.2.1802. He doesn't appear to have been the same person as John Diolott, who remained on Land Tax lists till 1807. Dulot and Tabart both in bbti.bham.ac.uk. So far drawn a blank on Diolott