biblatex uses American date format with british polyglossia

Question

While checking my references I noticed that the urldate is printed in the wrong format. My document is being typeset in British English, where it is common to write the date as Day/Month/Year, compared to the American format Month/Day/Year. The output of my references, however, is in the American format.

\documentclass{article}

\usepackage{parskip}

\usepackage{polyglossia}
\setmainlanguage[variant = british]{english}

\usepackage[backend = biber, citestyle = numeric-comp, language = british]{biblatex}

\begin{filecontents}{references.bib}
    @misc{Test,
        author = {NanoTemper},
        title = {{This is a test title}},
        year = {2019},
        url = {https://example.com},
        urldate = {2019-05-21}
    }
\end{filecontents}
\addbibresource{references.bib}

\begin{document}
    Foo bar\cite{Test}.
    \printbibliography
\end{document}

What should I use to get the British date format?