Thank you Russell,
Unfortunately such is the design of the printer that I am unable to gain access to the paper feed rollers without taking the entire machine apart.
I will have a go at cleaning the best I can, but my suspicion is that the fault is with the paper / ink cartridge, which is a combined unit
I don't know whether you have seen the Canon Selphy printer, but there is no way in which I can reach the pick up and paper feed rollers without taking the printer apart with a screw driver.
I am still unable to fix the problem. IO have contacted canon direct.