Further to the discussion elsewhere delving into the minutiae of Willis & Bates wartime paint hues, I just thought I'd throw this one into the, er, 'mix' (sorry) http://www.ebay.co.uk/itm/Vapalux-Halifax-E41-Lamp-Blue-/182062314332?hash=item2a63c2735c:g:uR8AAOSwuAVWyGwu I know Picasso had his blue period from 1901 - 1903 but that is ridiculous (IMHO, naturally!)...
That photo does look like the white balance is off (although I have no doubt that it's the wrong blue too!)
I was clearly so stunned by the eye-watering blueness of it that I failed to notice it's not even an E41, either...