A: Hi Noel,
Thank you for contacting Printerbase.
Unfortunately no it won't scan A3 documents. This is an A4 scanner therefore the maximum paper size you can scan is A4. For an A3 stand alone scanner you would be looking at spending £550.00 + unless you purchase an A3 inkjet MFP printer. You could look at the Epson WF-7710DWF - https://www.printerbase.co.uk/epson-workforce-wf-7710dwf-printer.html
Please do let me know if you require any further information.