Pompom bush - kerria japonica

You were right it is kerria japonica,

but there is also a Lady Banks connection.

The hardy deciduous shrub was named for William Kerr, British horticulturist from the 1800s, who also introduced the Lady Banks rose and nandina to our gardens.

With flowers as golden as a sunrise, Kerria japonica brings sunbeams to the shadiest spots of a garden.

Interestingly, this used to be a shady spot in the garden, but the neighbour's tree fell in a storm last year so now it gets a lot more light, but it still seems to be happy.

Read more at Suite101: Kerria Japonica: Shade-loving Shrub For The Garden http://www.suite101.com/content/kerria-japonica-a110464#ixzz1IGGuyfFT