https://www.bt.com/home/_next/static/HtCpmPsjTwPuziTsd6M1G/_ssgManifest.js

1self.__SSG_MANIFEST=new Set(["\u002F","\u002Ferror","\u002Fmaintenance"]);self.__SSG_MANIFEST_CB&&self.__SSG_MANIFEST_CB()

Line numbers count LF bytes from the start of the resource, as the search results do. Vendor segments are library code the classifier recognised; they are stored but not indexed. Bytes are shown as Latin1 characters, one per byte.