Plant is please. Keep or weed.

[pud1]

I have got a bit of a messy patch at the back of the garden. I have been meaning to tackle it for a while. I have just notice this. It seams to have come from no where. Is it a weed.

It's Orange Hawkweed, can become very invasive and is considered a real pest in USA. I'm trying to eradicate it from my garden (luckily it's fairly shallowly rooted) but it pops up everywhere. It's a very pretty flower and insects love it.