Got in the car this morning, engine started as normal, went to do 3 point turn to turn round, and the steering felt heavy - almost as heavy as when you try to turn the steering wheel without the engine running.
Completed the 3 point turn, drove to end of road wiggled steering a bit and it felt normal- maybe a bit heavier than normal.
Rest of the journey seemed ok.
Is this the power steering pump?
There was no excessive whining or screeching when applying lock.