My A4 Avant is out of power steering fluid again. This has happened to me before.

It was empty back in Sept 2011 @ 120,994 miles
It's now empty again Feb 2012 @ 125,356 miles
It was serviced Nov 2011 (Power Steering was not looked at).

A guy I work with noticed some fluid on the road outside work underneat my car, he thought I might have an oil leak.

Does this smell of a steering fluid leak ? Maybe on the rack ? I've heard the racks are not repairable, you have to have a new one circa £900 !!

And, if I want to top the fluid up, can I buy some from Halfords ?