Common Cat’s-ear, Hypochaeris radicata also known as False Dandelion..
The flower looks a bit like a Dandelion but the shape is very different. Cat’s-ear is a tall wiry plant with branched stems bearing several flower heads whereas a Dandelion is a single flower on a stem.
The wrong shape.
The other big difference is the timing. Although you might find a Dandelion at any time of year they are really a Spring flower.
This picture is Dandelions on the farm in April.
This next picture is the same field on May 12th. They come and they go and I look forward to them as much as the Bluebells.
Cat’s-ear flowers from June to September but it doesn’t give a spectacular display like the Dandelions.