Reversing noise

Best to take it back to dealership under the warranty and get it road tested / diagnosed .

Thanks for your response. This might sound like a silly question but as I purchased the car from a car dealer but not a dealership as such can I take the car to a Hyundai dealership as per the warranty? Please advise and thanks again.

Yes your car will still be covered .You should have service book giving all relevant details i.e date of purchase , supplier etc .though it will be logged in their computer also once they input the data .

Thank you for your assistance, appreciate it. Have noticed today that it only makes the noise when reversing up an incline. I am beginning to think that it could be the rear brakes (perhaps dust or dirt) which is the problem because the clutch is smooth as is the gears. thanks again!

From the further info you supplied , if it's a knock , could be exhaust hitting if mounting faulty/ broke .Dirt in brakes is always a possibility , causing them to stick until cleaned out .