Who pays to get a car under warranty back to the garage

[ath007]

My car has broken down and is within its 3 month warranty.
It is the clutch which is covered under the said warranty.
The vehicle is parked up 20 miles away from the garage where it was purchased.

Who foots the bill to get the vehicle back to the garage. Should they recover it gratis?

[AlBags]

Are you sure a clutch is covered? Unlikely.