John sells his property to Michael.
Michael has secured the purchase price (with cash or bank funding, as the case may be).
John needs the proceeds of the sale urgently for, among other things, rates and taxes and/or to place a deposit on another property he wishes to buy.
John makes application to Sw1ft for bridging finance.
Sw1ft advances up to 70% of the nett proceeds due to John from the sale of his property after all deductions, bond costs and the like have been duly considered.