Yellow flower

This is the only thing in our garden that doesn't seem to have died off for the winter! I can't remember what it's called but shall look it up and try to remember to add it on here.
Today has been filled with school runs, shopping, housework and learning the letter 'b'! Theo's "reading" is coming on well and I'm amazed how quickly he has picked it up - I shall not longer be able to have a secret conversation of spelling things out ("shall we go for c-a-k-e?")!