Tulips still in flower! ?

Last autumn, late, I planted some Bleu Aimable tulips.

I was disappointed to find that the only real "blue" is deep in the cup of the flowers.

However, they have flowered magnificently, and they are still showing petals.

Has anyone still got tulips in flower?

Can anyone recommend any other very late varieties?

The first pic is 13 May, the second is today, 10 June.