Ford KA power assisted steering suddenly not working

Last night whilst trying to park my car, my power steering suddenly went. It is now very intermittent and will cut in and out several times between locks. I have not had any problems with the steering until now.

All the chatroom threads I have read suggest the steering rack is gone. But I thought something like the steering rack would wear slowly and there would be signs of it wearing.

However my steering went mid lock.

Any help on this would be greatly appreciated. The last thing I need at the moment is to have to pay for a new steering rack, by the sounds of things it is very expensive.