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Possibly died 1801.
Burial record for St John the Baptist, Clerkenwell dated 24th November 1801 of a Thomas Stillwell aged 63 years from St Luke parish.

Silverly added

3 March 1755 Thomas son of John Stilwell late of Thursley in the County of Surrey Schoolmaster deceased apprenticed to Edward Branston Bayley London Clockmaker.

16 September 1760 Thomas Stilwell turned over to William Underwood for the remainder of his term. Related post: http://925-1000.com/forum/viewtopic.php ... ood#p78201

(Although Grimwade mentions Thomas Stilwell being described as a free Joiner, his trade and date of freedom coincide awfully well with this gentleman.)