Okay two issues:

1) Our site says BST even after it changes (Oct 31st) it should adjust to "GMT". Forget UTC it is a time format not a time zone I just read. 

2) The tool we are using to "Check your Timezone" is WRONG (I pointed this out before). Please change tool. 

SEE SCREENSHOTS OF ALL

This tool is more accurate:
https://www.timeanddate.com/worldclock/converted.html?iso=20211112T15&p1=861&p2=4364&p3=771