In the absence of a comprehensive and reliable source, for party and factional alignments in this period, no attempt is made to define them in this article.
The House of Commons: 1790-1820 provides some guidance to the complex and shifting political relationships, but it is significant that the compilers of that work make no attempt to produce a definitive list of each member's allegiances.
Where the cause of by-election is given as "resignation", this indicates that the incumbent was appointed on his own request to an "office of profit under the Crown".
Offices used, in this period, were the Stewards of the Chiltern Hundreds or the Manor of East Hendred and the Escheators of Munster or Ulster.
These appointments are made as a constitutional device for leaving the House of Commons, whose Members are not permitted to resign.