[Tex/LaTex] Correct \newgeometry retaining preamble settings

geometrymargins

I am writing a 350-400 page document using the report document class. The entire document uses the oneside flag as per regulations however I need the document to switch to twoside at a certain point. Mainly at the introduction of appendices.

I am using \newgeometry; however as per the doc this removes all geometry formatting used in the preamble. I would like to keep all margin definitions or settings such as headheight or headsep and simply switch to twoside.

I have just tried 

\newgeometry{a4paper,
 twoside,
 top=20mm,
 inner=40mm,
 outer=25mm,
 bottom=40mm,
 headheight=15pt,
 headsep=5mm,
 footnotesep=5mm,
 footskip=20mm - 1em}

This correctly switched to two side however it destroyed setting such as openright which I can only set in the preamble.

Best Answer

For anyone wondering for the solution for this, just put oneside,openright in the documentclass. Then later switch to twoside as you wish using \newgeometry.

\documentclass[11pt,british,english,oneside,openright]{report}
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