“5.-(1) Regulations may provide- (a) for requiring a claim for benefit to which this section applies to be made by such person, in such manner and within such time as may be prescribed; (b) for treating such a claim made in such circumstances as may be prescribed as having been made at such date earlier or later than that at which it is made as may be prescribed; (c) for permitting such a claim to be made, or treated as if made, for a period wholly or partly after the date on which it is made…”
“Where a claim . . . is made in respect of a period earlier than the day on which it is made,”
“In the assessment of entitlement to supplementary benefit upon a comparison of a claimant’s requirements and resources the emphasis of the statutory provisions is in our opinion upon the present and the future rather than the past”