There are a lot of free canon manuals to be downloaded at www.canon.co.uk . Try this first, select download software and then online support and see if your manual is listed
If the manula isn't there you could try a company called CRC LTD who can be contacted on:-
Any user manuals available directly from Instruction manuals UK or through private sellers are listed below.
Please email any enquiries regarding canon printer manuals to firstname.lastname@example.org