• noun Brit. informal a very easy task.
— ORIGIN of unknown origin.
If something is a doddle it is easy or straightforward, a cinch.
Of course, it wouldn't be cheap_as_chips if we didn't have a bit of Rhyming Slang ... and as we all know, why would a Cockney use one word when he could use two ... so the Rhyming Slang for doddle is Glenn Hoddle.
Glenn Hoddle is a former England footballer who went on to manage Chelsea and England.
That exam was a doddle
My new jobs a real Glenn Hoddle
BTW: Just a little reminder about the First and most probably last Annual Cheap_as_Chips Icon Challenge ... you have a week from today if you want to enter ;)