Off the top of my head, I believe most, or all, of our remaining debt is in the form of bonds denominated in dollars. But the club's accounts are presented in sterling, meaning that, for accounting purposes, the dollar debt is converted into pounds. If the dollar rises with respect to the pound, the value of the bond debt expressed in pounds also rises.
The practical significance of this depends on the sources of the club's income. If most income is in pounds then the club loses out. But if the club has significant dollar income this can compensate for the rise in debt. If, for instance, the club has negotiated its international sponsorship deals in dollars.
In any case, the bond debt isn't due for repayment for years. It's the dollar/pound exchange rate when the debt falls due that really matters. Right now the increase in debt is purely a bookkeeping issue.