Paragraph 15
England, Wales and Scotland
If a call remains unpaid after it has become due and payable the person from whom it is due and payable shall pay interest on the amount unpaid from the day it became due and payable until it is paid at the rate fixed by the terms of allotment of the share or in the notice of the call or, if no rate is fixed, at the appropriate rate (as defined by the Act) but the directors may waive payment of the interest wholly or in part.