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I believe there were 3 THREE Basil Denns
viz:-
Bazil Denn (the Elder), son of Bazil Denn who was apprenticed to William Fawson in 1715 -see Grimwade
Basil Denn ( the Younger ) who was apprenticed to his father (the Elder ) in 1745 (Goldsmiths Apprentice Book 7, page 70)
Basill Denn(Junior ) son of Basill Denn the Younger who was apprenticed to Basill Denn the Elder, Goldsmith in 1771
(Goldsmiths Apprentice Book 8, page 201 )

In PR1773 the the name appears twice
(a) as Bucklemaker at Tooley Street, Southwark .(This probably relates to Basill Denn the Elder as the will of 1777 refers to Tooley Street and to a Basill , his Grandson )
(b) as Ringmaker at Little Moorfields where he was recorded as Bassill Deun. One presumes this is Basil the Younger

The will of Basill Denn of Tooley Street in the parish of St Olave . . . Southwark..Goldsmith and Ancient Citizen of London was proved at PCC on 19 February 1777
It contains much detail on a marriage settlement made by this Basil in 1748 just before marrying "Mary Knight (now my Second Wife ) then of the parish of Saint Saviour in the Borough of Southwark" This certainly precludes it being the will of either Younger or Junior and ties in with Heal's references to Tooley Street, Southwark in 1771
Son Basill Denn and daughter Anne Phillips , wife of Thomas Phillips .
Grandson Basill Denn who was apparently not one of the children of Anne Philips, "and whereas I have already expended and laid out considerable sums in Bringing up Clothing Educating Maintaining and placing out Appprentice my Grandson Basill Denn and also otherwise provided for him and have never yet advanced or laid out one shilling for any or either of the children of my daughter Anne Phillips. . . " The five children of Anne were Thomas, John, Joseph, Mary and Jane Phillips .
"my leasehold Estate situate in Christopher Yard in the Borough of Southwark "
"I desire to be buried in St Mary Olaves Church Yard " again Southwark

Heal has a note in the British Museum trade cards index on Basil Denn that states "Contemporary adverisements show B.Denn was at Ye Ring on London Bridge from 1743 - 1754. A goldsmith of the same name in Aldgate was declared insolvent in 1729. " I can find no reference in the Gazette to this but there may actually be FOUR of them !

Records show various ways of spelling his christian name.
Reference above has been made to his second wife Mary Knight. His first wife was Joanna Catherina Carnaby whom he married at St Benet, Paul’s Wharf in 1727 when he was from St George the Martyr parish, Southwark and she from St Dunstan’s parish, Stepney.
Their son was christened Bazil at Holy Trinities, Minories in 1732, their daughter Catherina at St Thomas, Southwark in 1734 and their daughter Joannah at St Olave, Southwark in 1735.
A Joanna Denn was buried at Holy Trinity, Minories in 1735. Other burials in the same register identify whether the individual was a child. This burial appears to have been of Basile’s wife.
Thomas Sarson (Grimwade p.651) signed indentures to be his apprentice in 1729. In January 1734 Sarson was turned over to Richard Burcomb (Grimwade p.454) on the grounds that Denn’s business had failed. Heal had also recorded a failure of Basil Denn’s business occurred in 1729 but, as mentioned above, this may have related to Denn’s father Basil who was a tallow chandler.
In 1732 he paid Duty for the apprentice indentures of John Currey of Braintree, Essex.
He was assessed to Land Tax on unidentified property near London Bridge from 1736-59. The assessment book for 1760 shows the property as “empty-late Bassill Denn”. As previously noted the property was actually on the bridge itself. An Act of Parliament required demolition of all property situated there, this being completed between 1758 and 1762 and the Land Tax assessment books reveal a successive reduction of properties in Denn's neighbourhood.
The 1768 Poll Book listed Basil Denn of the Goldsmiths Company at Tooley Street.