As it is a very unusual name, the David Tullideph who wrote to Sloane in letter 4209 could possibly have been a merchant of Wisbech, Cambridgeshire. This David Tullideph was born in Scotland in 1705, and would have been 29 at the time this letter was written. Aside from a mention of a brother who may have known Sloane but was not a Fellow of the Royal Society, and an eagerness to visit Sloane at some point, it is unknown what connection he had to Sloane.
References:
David Tullideph to Hans Sloane, 1734-10-08, Sloane MS 4053, f. 284, British Library, London.
David Tullideph, WikiTree, [https://www.wikitree.com/wiki/Tullideph-11, accessed 17/08/2017]
Dates: to
Occupation: Unknown
Relationship to Sloane: Virtual International Authority File: