[3] In Paris, France, in 1792, Yorke witnessed Louis XVI's appearance before the convention and was close to the Sheares brothers, and others of the so-called "British Club".
[4] He baulked at a clause in a proposed and defeated resolution of 11 January 1793, encouraging an English insurgency;[5] and as a result was denounced by the economics writer Robert Rayment.
On 7 April 1794 he addressed a large outdoor meeting at Sheffield, convened to petition for a pardon to Scottish radicals convicted in political trials and to promote the abolitionist cause.
His writings from then on showed support for the war policy of the Pitt administration, and he wrote on 3 August 1798 a private letter to William Wickham condemning the views of the Sheares brothers.
He wrote letters for twelve months in The Star under the signature of Alfred or Galgacus (these were reprinted in a short volume), and was part proprietor of the True Briton.
After a bout of illness, he was asked by Richard Valpy to undertake an expansion of John Campbell's Lives of British Admirals, but left the work incomplete.