@Oured "Usury", at the time, indicated any form of lending at an interest, ANY interest, which the Christians were forbidden to do.
In that period, Edward was heavily indebted, due to the protracted campaign for the conquest of Wales and his effort to organise a crusade; to collect money, he imposed heavy taxation, and added the Jews expulsion to sweeten the deal to the lords. Also, all their properties were seized by the crown and all outstanding debts payable to Jews were transferred to the King's name.
These, and many other "details" you seem to have forgotten, are conveniently collected in this Wikipedia page
https://en.m.wikipedia.org/wiki/Edict_of_Expulsion