Just picked up car from having a bit of paintwork done. Car been standing or only moved short distances for about 4 days. When she started there was an alarming kind of cam follower rattle. Took about 2 miles before it disappeared. Never done it before and been fine since. Should I be concerned or is it perhaps dodgy oil. Not due oil service yet! 
I first heard this the very first time I got in the car after it had been shipped to Toronto from Vancover BC by train, and had been worried about the ticking issue on the car I had bought sight unseen. But I had remembered reading about this situitation and quickly figured that the car had probably been started and moved short distances not allowing it to warm properly during shipping. And like you said after a few miles it disappeared and I have only heard it a couple of times all in a similar situitation.