Does anyone know anything about A History of the Campaigns of the British Forces in Spain and Portugal published in London by T. Goddard at the time - volume 4 appeared in 1813 and included the Talavera campaign. That volume at least is on GoogleBooks and others are probably available there or on internet archive. I’ve not looked at it (yet), but I am curious who wrote it and why it has disappeared with so little trace.
https://books.google.com.au/books?id=NJk4AQAAMAAJ&pg=PA74&dq=intitle:Campaigns+intitle:in+intitle:Spain+intitle:and+intitle:Portugal&hl=en&sa=X&ved=0ahUKEwiR6aa7-JrnAhWhW3wKHZleA0oQ6AEIMDAB#v=onepage&q&f=false
I think I have also exhausted all obvious avenues. But I think I agree with @Zack White that it's some sort of semi-official thing, or at least published with authority. But @tomholmberg is probably also correct that it was assembled with the aid of periodicals and a pair of scissors!