\documentclass[a4paper, british]{memoir}

\usepackage{style}       % Custom style
\usepackage{mnfrontpage} % Front page
\usepackage{kantlipsum}  % Dummy text

\title{Title}
\subtitle{Optional Subtitle}
\author{First Author \and Second Author}
\kind{Report \#17\hfill\the\year} % Optional

\includeonly
{
    sections/abstract,
    sections/acknowledgements,
    sections/introduction,
    sections/chapter2,
    sections/chapter3,
    sections/chapter4,
    sections/appendixA,
    sections/appendixB,
}

\begin{document}

    \frontmatter        % Folios in Roman numerals, unnumbered chapters.

    \mnfrontpage

    \include{sections/abstract}
    \include{sections/acknowledgements}

    \cleartorecto
    \tableofcontents    % Or \tableofcontents*
    \cleartorecto
    \listoffigures      % Or \listoffigures*
    \cleartorecto
    \listoftables       % Or \listoftables*

    \mainmatter         % Folios in Arabic numerals, numbered chapters.

    \include{sections/introduction}

    \part{The First Part}

    \include{sections/chapter2}
    \include{sections/chapter3}
    \include{sections/chapter4}

    \appendix           % "Chapter" is renamed "Appendix"
    \appendixpage       % Similar to \part*{Appendices}, but appears in TOC.

    \include{sections/appendixA}
    \include{sections/appendixB}

    \backmatter         % Folios in Arabic numerals, unnumbered chapters.

    \printbibliography

\end{document}