What is this fluid leak/575?

Going into the 575s Garage for the first time in a couple of months, I noticed this big area of damp underneath the front passenger side (it’s a right-hand drive car) wheel area.

It wasn’t a pool, more a patch, although depending on the evaporative qualities of whatever fluid it is, it might have been a pool formed after I last drove the car a couple of months back.

Robbing my finger on the ground, it’s clearest (can’t tell if it had any colour) and slightly oily, but not engine oil I don’t think.

As you can tell, I am no mechanic.
The source seems to be somewhere under the bonnet nearest that wheel. The area under the centre of the car is completely dry.

I attached a couple of badly lit pictures, both of the size of the patch and the trail.. I would like to get an idea of what this might be before working out whether it’s safe to drive the car, to my service agent.

Thank you in advance
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Thank you, Brian. And you are right about my pictures, apologies. There isn’t proper lighting at the moment in the garage. Thank you for the advice on the replacement brand.

If it is a PAS leak, is it safe to drive the car 10 miles to the dealership? Beyond suddenly getting no assist on the steering?

 

Thank you, everyone. I will top everything up and make the trip. Brian, thank you also again, fortunately the place I use will fit good quality alternative parts also.

Given that it's now winter, I will probably wait til the MOT is due and also the annual service in March so I only make one trip. Then I will report back. I suspect it may also be cambelt change time. How the years go by..