New Zealand: Short-paid aerogramme form

New Zealand air letter form sent from Christchurch (5 JE 48) to the UK. Prepaid at 6d, the air letter was short paid by 2d for the 8d air letter rate.

Taxation handstamp „To Pay / 4d / Deficient Postage“ but contrary to UPU regulations no conversion of this amount into UPU centimes. No apparent postage due handling in the UK.