"... the “Fraser Fencibles”, was founded in 1794 by the ageing Archibald Fraser (last surviving son of “The Fox”), as part of a new system of domestic Scots Militia. He appointed James Fraser of Belladrum to raise them, but his son Simon [John Simon Frederick Fraser (1765–1803)] commanded them in the 1798 Irish Rebellion, where they acquitted themselves well."

Also see : https://books.google.com/books?id=pGJTAAAAYAAJ&pg=PA377
https://en.wikipedia.org/wiki/Highland_Fencible_Corps

Perthshire Fencibles (1794)
The Perthshire Fencibles was raised by William Robertson of Lude, who was appointed its colonel. Though designated the Perthshire Fencibles, it contained but very few Highlanders.[40]
[40] Browne, James (1854), history of the Highlands and of the Highland clans: with an extensive selection from the hitherto inedited Stuart papers, 4, A. Fullarton and Co., pp. 368–384 :
https://books.google.com/books?id=pGJTAAAAYAAJ&pg=PA382

Loyal Essex Fencible Infantry: In October the 'Loyal Essex Fencible Infantry', ten companies strong, were raised by Major J. E. Urquhart, and served in .... : Robert George Ernest Wood, 1937- , Essex and the French wars, 1793-1815. Essex CRO Publications no. 70, 1977 - Great Britain - 1 portfolio ([8] p., [40] leaves of plates : ill.) ; 31 cm.

A treatise on the Duty of Infantry Officers, and the present System of British Military Discipline. With an Appendix. By Thomas Reide, Esq. Captain in the Loyal Essex Regiment of Fencible Infantry, 12mo. pp. 258. 3s. 6d. Walter, and Egerton. 1798.