See also:

British Popular Opinion of the Peninsular War: 1808-1814
Ignacio Paz

https://www.napoleon-series.org/research/society/c_BritishPopularOpinion.html

Possibly:

Changing British Perceptions of Spain in Times of War and Revolution, 1808 to 1838
Holsman, John Robert

https://discovery.dundee.ac.uk/ws/portalfiles/portal/5232040/Holsman_mphil_2014.pdf