see Poland Street 19 to 44 in London Addresses dataset
John Avery 33 Poland St ratebooks 1785-7 / Gazetteer 28.1.1789 executors of John Avery deceased sell properties on south side of Oxford St nr Pantheon & at 4 Chesterfield St / John son of John & Sarah Avery bapt St James 31.10.1771 / John Avery adult bur St James 26.12.1802 / probably not the organ builder (see Grove's Dictionary of Music &c) who was however an interesting character see next para
London Gazette 18.11.1775 John Avery organ builder of St George Bloomsbury bankrupt, Public Advertiser 17.1.1776 commission superseded / John Avery Broad St Bloomsbury 1776 (SOURCE?) / John Avery organ builder Hanover St voted 1784 Fox / directory 1785 John Avery organ builder 10 Hanover St / John St, Tottenham Court Rd ratebooks 1786-7 John Avery / 1787 John Avery organ builder of St Pancras took appr Jno D Tolloner / General Evening Post 18.12.1790 John Avery, late of Charles St Westminster, but formerly of John St, Tottenham Ct Rd, musical instrument maker, bankrupt, London Gazette 1.3.1791 certificate / John Avery ratebooks 1798 St Margaret's Churcyard Westminster / 21.10.1801 his wife buried Harrow, Middlesex Morning Post 26.10.1801 / London Gazette 12.12.1801 John Avery of Queen Sq Westminster bankrupt / buried St Sepulchre (26.4.?)1807 from the Compter age 52 / said to have been often drunk and died in debt but also to have built organs of both quantity & quality. Possibly a father and son of the same name. Other John Averys / butcher of St John St died 1775 will PCC 1775,/ currier of Bridge St, Fleet St / coachman of St Geo Han Sq who married 15.2.1779 there Elizabeth Crupper widow botp by lic, probably the same as Elizabeth Avery of Adams Mews, Charles St, St Geo Han Sq who took admon May 1785 of husband John died April under £100 / John Avery bach = Lambeth 13.4.1763 Elizabeth Martin sp botp lic wits Andw Martin, Andw Cutler