The official status of a standard is one of the most common points of confusion. As of this writing, the edition remains the Current British Standard. It has not been formally superseded or withdrawn by the British Standards Institution (BSI).

Verify if it is the "Current" version. While BS EN 14015:2004 is widely used, a new project (2023-02456) is underway for a revised version with an estimated publication in Corrigenda:

BS EN 14015:2004, titled "Specification for the design and manufacture of site built, vertical, cylindrical, flat-bottomed, above ground, welded, steel tanks for the storage of liquids at ambient temperature and above," is the British implementation of the European standard EN 14015.

Acquiring the standard through official channels ensures you receive the most current, fully updated, and accurate document. Official Standards Organizations

For those who haven't seen the standard, here is a verified summary (not a substitute for the original):