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They married at St Marylebone in 1823, he a widower, Harriet Winfield a widow; both were from that parish.
Christening records at St Andrew, Holborn, one in 1825 and four in 1827 show the parents’ address as Holborn Hill and their father as a flageolet maker. The Wikipedia website indicates that a flageolet is a woodwind musical instrument of the fipple flute family. William Bainbridge introduced the “Improved English Flageolet” in 1803 and continued to work on the design to patent further improvements.
He entered a maker’s mark at Goldsmiths Hall in 1827 as a smallworker from 35 Holborn Hill.
His burial in 1831 aged 62 years is recorded at St Andrew, Holborn; his last address is simply recorded as “Holborn”.
The business was continued by his wife Harriet until it was sold around 1835. She had entered a maker’s mark in 1831as a smallworker from 35 Holborn Hill.

The Will of William Bainbridge, late patent flageolet maker of 35 Holborn Hill, was granted probate on 8th February 1831 (National Archives reference PROB 11/1781/423).

12 February 1805 William Bainbridge presented to the court to be made free of the city in the company of Loriners by redemption. Admitted to the freedom of the company. Musical Instrument Maker.

7 November 1814 Henry Thomas son of Henry Thomas Hastrick of Depford vict. apprenticed to William Bainbridge loriner.

4 February 1841 Harriett Bainbridge of No 35 Holborn Hill in the City of London will proved at London. Goodwill and stock of the business of patent flageolet maker bequeathed to son William Bainbridge and daughter Fannie Winfield .
Reference: TNA PROB 11/1940/225

2 December 1810 John Winfield Batchelor and Harriet Green Spinster both of the Parish of Saint Giles in the Fields Holborn Camden were married.

17 December 1816 John Winfield of Broad Street Bloomsbury in the County of Middlesex Pawnbroker will proved at London. Bulk of the estate was left to wife Harriet and daughters which included Fannie as the eldest were mentioned.