Thanks acboxer. It's a 208 Pure Tech Allure 130 EAT8 2250 miles, first reg. September 2020 but bought by me as a pre-reg in June 2021 at 780 miles. Maybe a hasty purchase as I could see prices rising quickly. The quality problems take me back to French/Italian cars of 25 years ago tbh. Aside from disappearing screenwash, water vapour is visible inside the offside headlamp and the fabric on the driver's seat squab is starting to wrinkle- at 2500 miles😟. I've also had to touch up the paint where it had flaked off around the same headlamp, the first time I've bought a car and had to do that since 1984! On collection, there was an unattached piece of trim on driver's B pillar. Robins and Day Coventry South completely dropped the ball on the first repair visit, apparently forgetting about the job and failing to order the parts. They got it right the second time after a written complaint. Also the stop start system only works if I connect a trickle charger approximately once a fortnight. That's due to short journeys I'm told. It's a pity because it's an effortless drive, has those lovely digital dials and 17" wheels (both deleted from Allure spec. now) and looks nice in Vertigo Blue.
Re the screenwash: I was suspicious of the tube to the rear wash/wipe initially, because it's obvious there had been some minor repair work on that side (the loose trim, plus burred door bolts suggesting the rear offside door had been rehung) - possibly a prang in Robins and Day's hopelessly overcrowded car park. But I can see no leaks. The screenwash is close to the coolant reservoir as the pics show, and it does heat up noticeably, which is why I accepted the evaporation story at first. I've sometimes found a few drops on the outside of the lid.