No. If you handed over the coupon in the shop, the price would be reduced by fourpence.
In the old pre-1971 currency, 4d (fourpence) was often written as one word, and pronounced /ˈfɔ:pəns/. Nowadays we write 4p as two words, and pronounce it as /fɔ: pens/ or /fɔ: pi:/
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