“For example, where the request is for money to buy a house, he must be satisfied that there is a real need for accommodation now as opposed to after the trial and that the amount of money requested is reasonable. He does not need to decide whether the particular house proposed is suitable, that is a matter for the Court of Protection, but the judge must not make an interim payment order without first deciding whether the expenditure of approximately the amount of money he proposes to award is reasonably necessary. If the judge is satisfied of that to a high degree of confidence then he will be justified in predicting that the trial judge would take that course and he will be justified in assessing the likely amount of the final award at such a level as will permit the making of the necessary interim award”