“When it is clear that the victim can be properly compensated, and that what remains in the hands of the defendants is a relatively modest sum, the residue of a lifetime’s legitimate savings, the court may wish to take that factor into account. …. if and in so far as the judge in the present case thought that he would be able to spare the appellants some of their funds, when in reality, at the end of the day, they were going to be liable to those who were the victims of their offences for more than their assets there was simply no route by which he could achieve that perhaps desirable route.”