www.925-1000.com

He was christened at St Luke, Finsbury in December 1793 the son of Joseph (Grimwade p.339) and Rebecca Glenny.
He entered a maker’s mark at Goldsmiths Hall in 1815 as a case maker from 21 Wynatt Street from where his father Joseph entered his own mark as a case maker in 1819.
He married Hannah Brookes in 1815 at St John, Clerkenwell; both were from St James’ parish, Clerkenwell.
The christenings of two of their children at St John, Clerkenwell in 1816 and 1818 recorded their address as Wynatt Street and their father as a watch case maker.
He obtained his freedom in the Company of Clockmakers in 1819.
The christening of a daughter at the same church in 1820 showed their address as 127 Aldersgate Street and her father as an actuary with the General Benefit Insurance office.
He is recorded in the Dictionary of National Biography (p.1337). An amateur gardener from an early age in Hackney he went on to be an author, columnist and editor of various papers and magazines, in 1832 founder of the Metropolitan Society of Florists and Amateurs and in 1839 founder of the Royal Gardeners’ Benevelont Institution. He was directly involved in the campaign to obtain removal of restrictions to access of Kew Gardens.
He was buried at Norwood Cemetery, Lambeth in 1874; his last address was Colby Street, Gipsy Hill, Norwood.
His Will was proved at the Principal Registry in the same year; the value of his estate was under £100.

Regarding Joseph, George's father, I'm wondering if it was his stock in trade that was advertised for sale in The Times, 4 June 1816, as below. Although the notice doesn't indicate this, it's likely the sale was forced by bankruptcy (?)

To Watch-Case Makers and others - By Mr. W Davies, on the Premises, 20, Red Lion-street, Clerkenwell, on Thursday, June 6, and following day, at 11.
ALL the STOCK and Utensils in TRADE, fixtures, . . . and other effects of Mr. Glenny, watch-case maker, comprising gold and silver cases, a quantity of copper wire, 16 turning lathes, a flatting mill, 2 draw benches, work boards, forges, stamping weights, copper pans, melting pots, & . . . Mr. W. Davies, auctioneer, Giltspur-street.

March 12, 1819.
Take notice, that no dissolution of Copartnership between Samuel James Tibbs and myself of Wynyatt-Street, Goswell-Street-Road, Watch-Case-Makers and Working Silversmiths, has taken place ; and the advertisement announcing the same in the London Gazette was inserted without any knowledge or consent.
Geo. Glenny.

Source: The London Gazette - 13th March 1819

The original notice that appeared in The London Gazette to which the above post refers:

March 8, 1819
Notice is hereby given, that the Partnership between, the undersigned, Samuel James Tibbs and George Glenny of Wynyatt-Street, Northampton-square, Watch-Case-Makers and Working Silversmiths, is dissolved on and from the date hereof.
Sam. Jas. Tlbbs.
George Glenny.

Source: The London Gazette - 9th March 1819