Help identifying this weed, please?
This grows in all the cracks in the concrete, and from the dry-stone walls as well. It looks like a hawkweed, but the leaves are variegated, and broader and more rounded. Multiple stems with groups of yellow flowers and dandelion-like seed heads. In flower from July onwards. I can't seem to find it anywhere in books or online, so any information would be appreciated.

It's possible that I brought it with me when I moved to Sheffield from Hertfordshire 25 years ago.
It's all over the garden and easy to get rid of by hand, but I quite like it so tend to leave it - hoverflies like it.
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http://www.perennials.com/plants/hieracium-maculatum-leopard.html
it is a hawkweed, i like those leaves
In the sticks near Peterborough
Yes hawkweed. I think I've seen them in orange too - quite pretty for a weed.
It's a lovely plant and whilst you may not want to let it seed you should enjoy it for what it is.... and let your friendly hoverflies have their enjoyment too.
I think the orange one may be our only native orange-flowered plant. The way the orange one propagates itself by underground runners means it can quickly become a pest. I manage to keep it under control though (just.)
Thank you - wow that was quick nutcutlet! Most grateful.
I have drifts of it all along one side of the house, and am quite happy for it to seed and spread - as I said, it's easy to remove. I have a very bee-friendly garden, so it fits in well. Thanks again.