Steering Box Leak


I've a 95 Independant and I've had a bit of groaning when the cars just started from the power steering.
Having had a look it seems to be leaking power steering fluid from under the Nut with the slotted bolt. However this was all loose so I've tightened it up. Will this cure it or am I looking at a new box?
I only ask as it did it this morning again after tightening the bolt. it looks like its got enough PS fluid but I will top it up

Steering box leak

Had a similar thing occur to my F75. Tightening the nut solved the problem and it has not been a problem since. I check the nut once a month or so.