Top it up with power steering fluid from VW - see post below - you need special mineral oil NOT synthetic so DO NOT GO TO HALFORDS!! as I originally suggested!!! tomorrow and after you have driven it home, leave it somewhere where overnight where you can see if any oil has dripped out - a clean, dry concrete floor would be best but make sure there are no other oil marks before you start.
The next day, if you have leak, you should be able to accurately identify where it has come from.
If necessary, jack the car up so you can see better with a good torch or lamp but, please, do NOT crawl underneath unless you have proper axle stands of the right weight capacity in place and the wheels chocked as even with a good height clearance like a Treg, a car bouncing down off a collapsing jack can do you a lot of damage.
If there is no obvious leak, I would definitely not ignore the symptoms and I'd get the car to a dealer ASAP anyway.
I have purchased and topped up the oil and checked the tyres at a garage compressor and they were 10 psi down on the fronts, this + the topup = happy treg. Im going to keep my eye on the level but after reading forums on other vag cars its fairly common for it to dissapear with age.
OK now heres the warning. I looked at the topup reservoir which says to only use mineral oil. Now I went to halfords to get some oil and all of the hydraulic oil they sell is synthetic, in fact finding mineral hydraulic oil is hard. So off I went to VW. They had a bottle on the shelf which is G004000M2 a replacement for G002000M2. The cost was ?6.83 for a litre (enough to fill the reservoir about 3 times) compared to halfords ?12+ synthetic jobs. So cheaper
Now after some research it appears on other forums that most non vag mechanics / silly users fill up the hydraulics with synthetics. This is terminal to the system and it corrodes all of the rubbers etc in the system leading to anything from leaky seals to pump / rack failures. Any VAG Mineral oil should apparantly be green. So if it aint green in the tank its more than likely to be synthetic.