I'm not interesting in submitting to them, but someone indirectly wanted to know if they were legit because he wanted to know if a book Amberly put out was any good. It was suggested that Amberly is a vanity press.
Their website leaves a little to be desired--I think that they are working on it and that there are a few wild links. The site has changed over the past few days. Otherwise they look legit to me.
We welcome unsolicited book ideas in the subject areas covered by Amberley.
All their books are UK history, but they do have claim to have a Spanish branch in Madrid. (Link is broken)