This was taken last week in the garden as a bit of an afterthought. It is winter jasmine, or Jasminum nudiflorum and got a mention in yesterday's post as one of the few plants in flower at this time of the year.
It is not native to these parts, but originates in China. It has naturalised in parts of France the US but is not invasive. Other plants in the same family, Oleaceae, include olive, privet, ash, forsythia and lilac.