Biber with British option is not supported
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ekleinod
When I use the changes package with biber that has the language set to "british", I get an "Undefined control sequence" error when I use commands such as \added or \deleted.
I have recently asked a question on this on StackExchange and a workaround was suggested, but I am wondering if it could be fixed in the package to benefit others as well.
Thanks for your bug report. I fixed this soon after you filed the report but I did not have time to upload the solution to ctan yet.
The bug should be fixed, if it still is valid, please reopen the bug report.
I just uploaded the package to CTAN, please allow a few days for distributing the package to your LaTeX distro updater.