Blue Iris

Although we still haven't solved Monday's moorland flora puzzle, here's another for you.

No less an authority than the Collins Gem book of Wild Flowers assures me that there are only two native irises, Yellow Flag, which we have plenty of on the moor, and Stinking Iris. I'm almost certain this isn't the latter, which marks this as a likely garden escape.

looking
at the moor
blue iris

If any of you are iris experts perhaps you could name this one for me?