As the owner of a substantial estate in north-west Kent, Walsingham was one of the most prominent members of the Kentish gentry. In April 1601 he was instructed by the Privy Council to help organize the county’s reception at Dover of the French ambassador, and in November 1602 he and eight others were authorized by his shire to compound for purveyance with the board of greencloth.
Walsingham’s wife, Lady Audrey, was described by Lady Anne Clifford as one of ‘the great favourites of Sir Robert Cecil†’.
Following the attainder of Henry, Lord Cobham, in 1603, Walsingham was appointed to help receive his disgraced neighbour’s rents and debts on behalf of the Crown.
Walsingham accompanied Henry Howard, earl of Northampton to Windsor in May 1605 on the occasion of the latter’s investiture as a knight of the Garter.
In 1614 Walsingham was returned as junior knight for Kent after threatening to dispute the seat with Sir Edwin Sandys,
Sir Thomas Walsingham was one of the six sub-commissioners to the commissioners for exacted fees appointed in May 1623, but it is unclear whether this was Walsingham himself or his son, Sir Thomas Walsingham II*. During the 1620s Walsingham became concerned that his son was living beyond his means, and in his will, drafted on 5 Aug. 1630, he consequently reserved the rents from three properties for his grand-daughter, Katherine, as her portion.
