I bought one of these originally from ShoppingCentre through Amazon. It did not work, and I returned it; no hassle - ShoppingCentre were responsive and took care of it. I assumed I had been unlucky. I then bought another one immediately, directly from Amazon (SH were out of stock). This second unit did not work either, and I returned it today - Amazon as usual making this painless.
Basically both units had the same fault - they simply do not stop the water flow when set to the 'off' position. Yes, I do know how to operate such simple devices, the battery was fine, and there is no issue with high water pressure.
I can only assume there is a design or manufacturing fault, but either way there is clearly no effective quality control deployed in the manufacturing process, so I'd personally avoid 'Silverline' products like the plague.
I have heard of design issues with Hozelock, but have had good previous experience with Gardena timers (until one froze solid this Winter - which is my own fault), so I'm afraid I'll end up paying double the price for a Gardena unit. Pity the C1030-Plus isn't currently offered by Amazon!