Eventually the penny dropped, sorry for being thick !
This is outstandingly horrible !
My summary for anyone in the same boat suffering from brain failure at the end of the week:
You have to go to 'Tools/Options/LibreOffice Impress/Print
Make sure Paper tray from printer settings is unchecked
Then 'File/Print' ( at this point the Print/Properties are wrong and greyed out )
Then 'Options' and check 'Use only paper tray from printer preferences' and 'Use only paper size 
from printer preferences'
Then go back to 'General' select the printer and go to 'Properties' ( If you don't do this now it 
forgets the previous step )
The paper size and orientation are now available to change
Then OK
It will then work for the duration of the session as A3 and Landscape are now selected ( but greyed 
out again )
Once you save it and open it again you have to start from the beginning.
Mal
 From:   Mike Scott <mike@scottsonline.org.uk> 
 To:    <users@global.libreoffice.org> 
 Sent:   09/10/2015 9:54 AM 
 Subject:   Re: [libreoffice-users] Printing in Impress 
On 09/10/15 09:31, Malcolm Moore wrote:
Hi,
Yes the printer does A3 and borderless
Creating an A3 presentation ( Format page / Page )
will not print as A3 it always comes out as A4.
Using 'Use only paper tray from printer preferences'
means it prints landscape but it is still on A4
As Regina said, you also need to set 'use only paper /size/ from...' as 
well. Otherwise I see the same symptom (landscape, and size locked to A4).
BTW, Impress seems to pick its size differently from Draw, which chooses 
a more useful default of A3 for an A3 drawing.
Haven't we only just been here? :-) :-) :-)  I suggest again that the 
Print dialogue could use some improvement in this area.
An A3 Writer document prints as expected
Ta
Mal
  From:   Regina Henschel <rb.henschel@t-online.de>
.....
For to enable the printer settings you need to check the options "Use
only paper tray from printer preferences" and "Use only size form
printer preferences" in the tab "Options".
Kind regards
Regina
-- 
Mike Scott
Harlow, Essex, England
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