Vibration over 50mph on gradual turn left

Hi there i have recently purchased a Disco 2 td5 and have noticed that while travelling over 50 mph ish when i turn the steering wheel left there is a vibration/wurring noise that appears to be coming from the front end and im unsure is it likely to be cv joints or propshafts ? i am a new owner so any help diagnosing or advice as to how to track down exactly what it is would be greatly appreciated.
thanks