Add chartiable body number footer

letter.tex

@@ -15,6 +15,9 @@
 \begin{tikzpicture}[remember picture,overlay,shift={(current page.north east)}]
   \node[anchor=north east,xshift=-3cm,yshift=0.2cm]{\includegraphics[width=4cm]{strath_tab_sci.pdf}};
 \end{tikzpicture}
+\begin{tikzpicture}[remember picture,overlay,shift={(current page.south west)}]
+  \node[anchor=south west,xshift=3cm,yshift=1cm]{\footnotesize{The University of Strathclyde is a charitable body, registered in Scotland, number SC015263.}};
+\end{tikzpicture}
 
 
 \opening{Dear X,}