The postcode-to-coordinate data is now freely available as "CodePoint Open"

So there's already data for people who want to know postcode AB10 1JL corresponds to the area around 57.14677,-2.09873

The PAF is a more detailed data source, as seen in https://www.royalmail.com/find-a-postcode which can tell you that AB10 1JL specifically covers the addresses

102-104, Union Street, Aberdeen

82, Union Street, Aberdeen

Timpson Shoe Repairs Ltd, 86 Union Street, Aberdeen

Smart Mobile, 88 Union Street, Aberdeen

92 Union Street, Aberdeen

98 Union Street, Aberdeen

The PAF is useful if you want to provide a "quick address entry" option on your website - and to validate address data. But if you just want postcode-to-location conversion, that info is already available.