Possible Clues:

• Individual accommodated in my conversion is finding resistance from one of those exchanging notes for the coppers
• Runs laundry business in capital for English copper on fifth floor
• Someone who is paid agio
• Presumably provides a real alternative to one of those running laundry business?
• Knows the value of going from one capital to another by working out how much reportedly Frank's conversion costs
• Sounds like makes sense of old Penny in laundry business?
• He may offer a real alternative