- Letters from Simkin the Second to His Dear Brother in Wales
- Strictures on Mr. Burke's Two Letters Addressed to a Member of the Present Parliament on the Proposals for Peace with the Regicide Directory of France, and Upon the Proposal for Funding the Navy Debt
- Letters From Simkin The Second To His Dear Brother In Wales: Containing An Humble Description Of The Trial Of Warren Hastings, With Simon's Answer (1788)
- An Elucidation of the Articles of Impeachment: preferred by the last Parliament against Warren Hastings, esq. late Governor General of Bengal
- An Examination of the Expediency of Continuing the Present Impeachment