Ok so an update on both the rear washer and brake noise. I took the car in yesterday and the service adviser tried to dismiss the dribble from the washer jet as something that a) has always happened, I just didn't notice it for the 1st month of ownership and b) something that probably won't get fixed. From this point I switched off from him and kept firm in my description of it. I went out for a spin with one of the techs, we didn't get off the forecourt before he noticed the click/clunk and agreed it was odd. First thoughts were possible excessive movement of the pads in the carrier but he was going to do a full diagnostic anyway. He couldn't quite believe what the old service adviser had said when I went on to explain the washer fault. The old guy was quite insistent that there was no valve or anything, to which I said my brand new 20k Touran doesn't leak, so didn't I spend enough on my Up! He remained quiet to that. In the afternoon I got a call from another service adviser, the one I should have seen when I dropped my car off. This on was good, and it turns out that a new flow valve is required for the washer jet and my osf brake calliper was faulty and leaking brake fluid! Good job I took it in. All fixed under warranty with no hassle. I went to pick my car up today and the old guy was asking the good adviser what the issue was and was surprised when it was a valve. I said to the old guy I told you I wasn't imagining it. The muppet. But all is good and a great turn around from the VW folks. Fingers crossed it remains fixed.