Althorp Papers. Vol. dlxxiv. Correspondence, minutes, etc., put together by Spencer, concerning events leading to the fall of the Grenville ministry; Feb.-March 1807.
Althorp Papers. Vol. dlxxxii. Correspondence chiefly relating to canvassing for Viscount Althorp's election for Northamptonshire, but also mentioning Wigan amongst other boroughs; Feb.-Dec. 1806.
Althorp Papers. Vol. dlii. Parchment roll certifying the amounts of money received and expended by the 2nd Earl Spencer for ‘secret services’; Dec. 1794 and Feb. 1801.