The English in France are not taxing French resources at all.

All their food-supplies, including the hay for their horses, come from England.
The English troops are also well supplied with money from home.
Outside the regular Tommy Atkins, the volunteers and territorials coming into France have abundant money.

They are the men from the cities and from the wealthiest families in the country life of England.
There are more than 300,000 of them on French soil, and as they come and go in France, they are spending not less than four shillings a day each, or nearly four times their wages.

This makes a daily expenditure of 60,000 pounds sterling in France, and calling for exchange.

Hence the English pound has been at the lowest price in France on record, 24.95 and sometimes 24.90.
There is also the additional reason of higher insurance rates for the transportation of money across the Channel,--a channel infested with mines and submarines.