This beauty is definitely a Mallow (Malva sp.) but it seems paler than the Common mallow (Malva sylvestris), whose flowers are usually a much deeper pinkish-lilac with even darker stripes.
I found it growing on Penarth’s rail trail, a railway line to Barry that fell foul of the Beeching cuts in the 1960s and has since been converted, in part, to a much-used walking and cycle path. The trail is edged on both sides by houses so this plant could very easily have flitted over a back fence or been dropped as seeds by birds. Whichever, its flowers are a very pretty addition to the foliage that lines the trail.
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earthstar 
There was a nature reserve near where I used to live that had been developed on old railway land and there was very pale mallow growing there – maybe it’s something in the soil to do with the railway? Rusted iron, maybe? Some sort of deposit.
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An interesting theory, thank you. 🙂
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That looks about the same depth of colour as the ones I grow. I sowed some seeds in the back garden, may years ago, but now they come up more in the front garden; it is probably sunnier there.
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Sounds like you have a lovely garden. 🙂
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No, I don’t! It is just a mishmash of things that I was able to do when I could walk properly. I still enjoy it though. Just pushing the hoe along is constructive, as is filling bird feeders.
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Mishmash is good, as is feeding the birds. 🙂
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