Here are Tom Johnson's ledgers for the two time periods we have them.
1906 to 1912 Ledger
This documents shows Tom's finances in London from 1906 to about 1910 when he came to Canada. The currency changes then and he continues on until he is homesteading in the Stoney Lake area in 1912. So the costs of his lifestyle in England and in Canada are comparable.
Note today one British Pound is worth about 1.81 Canadian dollars.