I've just been and had a good look at the route the washer jet piping (& wiring) takes, there's not a lot to see really.
The piping from the jets is hidden inside a box section across the rear of the bonnet, and emerges from a grommit on the passenger side (or drivers side for our European cousins on here!), then disappears out of sight under the black panel in front of the windscreen.
How it gets from there to the washer bottle I have no idea - I guess must somehow route above the wheel arch liner, and where the heated jet wiring would connect I do not know.
Son -> You probably won't be able to see much more, but you might be able to peep under the black strip in front of the bonnet, and see if the wiring follows the same route into oblivion as the piping.... The rubber bonnet seal just pulls off, and you can lift the end of the black cowling up slightly to see in.
Grieg -> Forgot to check the prices, but will be going back soon when my intake bits arrive so I'll try and remember to check then.