Landscape output

[Peter Gentry]

Hello

My paper block is
% -----------------------------------------------------------
% set the paper layout for binding
% footer has title and page number
% -----------------------------------------------------------
 \paper {
                #(set-default-paper-size "a4" 'landscape)
                two-sided = ##t
                top-margin = 10\mm
                bottom-margin = 10\mm    
                inner-margin = 20 \mm
                outer-margin = 15 \mm
                binding-offset = 5 \mm
                first-page-number = #1
                blank-after-score-page-force = #10
                page-breaking = #ly:page-turn-breaking   
                ragged-bottom = ##t 
                indent = 5\mm
                print-page-number = ##t
                print-first-page-number = ##f
                oddHeaderMarkup = \markup \null
                evenHeaderMarkup = \markup \null
                oddFooterMarkup = \markup {
                                                 \fill-line {
                                                   \null \fontsize #2  
\fromproperty #'header:mycustomtext 
                                                      \on-the-fly 
#print-page-number-check-first
                                                   \fontsize #2  \fromproperty 
#'page:page-number-string
                                                              } % end of fill 
line

                                                          } % end of markup 
block
                evenFooterMarkup = \oddFooterMarkup
         } % end of paper block

But the pdf output is still A4 Portrait where am I going wrong?

regards
Peter Gentry