That case does not carry the point any further ; it is really only
an application of this principle. While he was a member of the
forces the respondent had a right to a sum of money which was
in the nature of a debt. That money accrued due to him from day
to day while he was in the forces but was payable at a future date.
All the regulations must be considered in conjunction with reg. 31.
That regulation itself conceives that moneys are then due and it
gives a right of action to recover such moneys. Regulation 31
provides for the right to enforce payment of moneys under an agree-
ment and in order to prevent that from having the effect of creating
a contract reg. 32 was inserted merely as a matter of caution. Reg-
ulation 31 draws no distinction between active pay and deferred pay.
If money was due to a member of the forces on his discharge it
must have been due to him from the day on which the pay was earned ;
the day on which it accrued. It must always have been due from
the particular day in respect of which it was payable. Regulation
31 assumes that the money is due and, in effect, poses the question
as to how much is due. The fact that that pay is due prior to dis-
charge is recognized by the regulations themselves, e.g. Air Force
Regulations, regs. 528, 5424 and Air Force (War Financial) Regula-
tions, reg. 31. The moneys, being due, are due as a right and the
fact that they are due as a right is acknowledged by reg. 541 of the
Air Force Regulations. That regulation means, by implication, that
there are vested rights in rates of pay created by the regulations.
'The provisions of those regulations specially create a vested right, e.g.
reg. 31. The true meaning of reg. 541 is that it does not relate to
pay as a sum of money but relates to a rate of pay or a rate of deferred
pay, that is to say that because a member is being paid a certain rate
of pay he shall not have any right to continue to be paid that rate of
pay unless the regulations otherwise provide. The words " rate of "
as there used apply not only to pay but also to deferred pay, allow-
ance, or any other emolument. Regulation 5 (2) of the Air Force
(War Financial) Regulations does not operate as a bar to the respond-
ent's action. Whether that regulation is affected by s. 48 (2) of the
Acts Interpretation Act 1901-1941, or not it cannot affect this action
if, as is submitted, the regulations altering the rate of pay are,
because of their retrospective operation, themselves involved. The
respondent had a right to deferred pay in April 1943, hence it was