This might sound like a very basic question, but....

This year I'm trying to grow some vegetables. One of the first I've planted
was a row of turnips. They grew fine until a about a week ago, now several
of them have suddenly shot up to about three feet tall and have some
'flowers' on the top. Have these 'bolted' What should I do? All my gardening
books don't mention this.

Pleased bear in mind that I'm a complete newcomer to this.

--
Steve