http://www.parisschoolofeconomics.com/hautcoeur-pierre-cyrille/M1_Histoire/Nye.pdf
It is a myth that the United Kingdom was a free trade nation in the 19th centur. I suggest you examine my source above, as it may change your perception of history.
“These numbers are taken from Albert Imlah’s reworking of the British trade statistics”
And Imlah’s “reworking” is not in agreement accepted data.