This will depend on whether the cash is paid as a capital or income payment.
Capital: The cash will be paid into the Hargreaves Lansdown Account from which the cash originated. It will remain within this account, earning interest at the prevailing rate, pending your instruction.
Income: The cash will be paid onto your income account and will be subject to any standing instruction you have given us for that income, i.e. hold on deposit, reinvest or pay out.