mondeo 2.0 tdci lx 2003 - Mondeo 2.0 tdci 2003 power loss - penderri

Hi everybody,
Just joined your forum as I have a problem with my Mondeo 2.0 lx tdci 2003 110k.
I just purchased this car from a liquidation sale ( as seen ) I have driven the 50 miles from the sale to my home. It started fine but had a LOUD wining type noise on revving very much like a high pitched bearing noise. As most of the 50 miles was Motorway I nursed the car for the first 10 due to the noise. Suddenly the noise stopped with the car driving ok but unable to go over 50 mph. As I got close to the end of my journey I decided to push it a bit harder only to be able to reach 65 mph.
The oil is ok as is the water etc,. Any ideas?
Thanks for reading