Andy,
(Looks like mwenz posted at the same time as me)
I looked at your two files and I think they are setup for A4 size not A3, if what I googled for sizing was correct. I would double check this because you do not want to have the printer try to blow them up to A3 if you only want the A4 size.
If you really are looking for the A3 size then you need to set your page up for the proper size, remember the bleed also. The current page is portrait layout and the pexel background is landscape. You will need to crop the new background so it fits to the page. You may have to shrink it in order for it to fit. Play around with it a bit and should not have too much trouble.
Once every is lined up correct then you are going to export the file in as a PDF. Ask you printer if they have a preference on PDF type.
Ask on here if you are confused and someone will help.
Ray
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