diff --git a/01-intro.Rmd b/01-intro.Rmd
index 32b947e57cc624d7c96abc2ce109ee0978f28567..a7785a9f427f6a526dc6f47888192a1f4a0d86a5 100644
--- a/01-intro.Rmd
+++ b/01-intro.Rmd
@@ -1,3 +1,10 @@
 # Introduction {#intro}
 
-Background and introduction chapter
\ No newline at end of file
+Background and introduction chapter
+
+Equation \@ref(eq:binom) is an example of how to make a referenced equation:
+
+\begin{equation} 
+  f\left(k\right) = \binom{n}{k} p^k\left(1-p\right)^{n-k}
+  (\#eq:binom)
+\end{equation} 
\ No newline at end of file
diff --git a/03-results-01.Rmd b/03-results-01.Rmd
index 86c181e1418bacfde49a4eed1312328932376638..a1b71d03f6cfc8dda96bac5266831c7e965c877c 100644
--- a/03-results-01.Rmd
+++ b/03-results-01.Rmd
@@ -1,10 +1,18 @@
 # First Results {#results-1}
 
-First results chapter.
+First results chapter with Figure \@ref(fig:fig1-chunk).
 
-(ref:mpg-plot) Car engine size versus fuel efficiency. The mpg data contains observations collected by the US Environmental Protection Agency on 38 models of car. 
+(ref:mpg-plot) Car engine size versus fuel efficiency. The mpg data contains observations collected by the US Environmental Protection Agency on 38 models of car.
 
-```{r mpg,echo=FALSE,fig.cap ='(ref:mpg-plot)', fig.scap='Car engine size versus fuel efficiency',out.extra='',fig.align='center',cache=TRUE,warning=FALSE,fig.pos="H"}
+```{r fig1-chunk,echo=FALSE,fig.cap ='(ref:mpg-plot)', fig.scap='Car engine size versus fuel efficiency',out.extra='',fig.align='center',cache=TRUE,warning=FALSE,fig.pos="H"}
 ggplot(data = mpg) + 
   geom_point(mapping = aes(x = displ, y = hwy, color = class))
-```
\ No newline at end of file
+```
+
+> **Notes** The caption comes from the text following `(ref:fig1-caption)` and 
+this has to be all one line like so:
+
+>`(ref:mpg-plot) Car engine size versus fuel efficiency. The mpg data contains observations collected by the US Environmental Protection Agency on 38 models of car.`
+
+> Whilst the reference number to the figure itself comes from 
+the code chunk name `fig1-chunk` inside the referencing syntax `\@ref(fig:fig1-chunk)`.
\ No newline at end of file
diff --git a/_book/thesis-dissertaion.pdf b/_book/thesis-dissertaion.pdf
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diff --git a/_bookdown_files/thesis-dissertaion_files/figure-latex/fig1-chunk-1.pdf b/_bookdown_files/thesis-dissertaion_files/figure-latex/fig1-chunk-1.pdf
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diff --git a/_output.yml b/_output.yml
index 9d713dfcebdba163799d0466b56e797b8b8bd2dc..b2821df981f60618d3d0b13505eaf4ec7466dab2 100644
--- a/_output.yml
+++ b/_output.yml
@@ -1,5 +1,5 @@
 bookdown::pdf_book:
-  latex_engine: xelatex
+  latex_engine: pdflatex
   includes:
       in_header: tex-files/preamble.tex
       keep_tex: yes
diff --git a/tex-files/preamble.tex b/tex-files/preamble.tex
index 591d36e04ba4594c91be4bf26c9c0e418b1170b2..8e9d7f501ab2b8630a4f49813a92d1c7d61e9af8 100644
--- a/tex-files/preamble.tex
+++ b/tex-files/preamble.tex
@@ -1,7 +1,8 @@
 % Peamble - load all the packages
 \usepackage[none]{hyphenat}
-\usepackage[T1]{fontenc} % Use 8-bit encoding that has 256 glyphs
-\usepackage[default,osfigures,scale=0.95]{opensans} % Open sans font
+\usepackage[utf8]{inputenc} % For greek letters and othe unicode symbols
+\usepackage[scaled]{berasans} % Sans font
+\renewcommand*\familydefault{\sfdefault}  %% Only if the base font of the document is to be sans serif
 \usepackage{lmodern}
 \usepackage{lettrine} % The lettrine is the first enlarged letter at the beginning of the text
 \usepackage{appendix}