So far as I know there isn't any real difference in the way the two species look. Officinalis is a native of northern Europe and saccharata of France & Italy. Both can be viewed therefore as 'wild flowers'.

And a nice picture, too. Phil J

Thanks for your responses.
Mg, are you able to say more on the subject of wildflower identification? I suspect that the identification of a particular plant as wildflower or cultivated is quite difficult if not impossible. Buying a plant from a Garden centre, the label gives no clues and of course, a plant that appears in the garden courtesy of a bird doesn't have an identity card. I have a couple of books about wildflowers and the D G Hessayon 'Expert' series. The best one about wildflowers I have is 'Wildflowers of Britain' pub Readers Digest Which doesn't mention Pulmonaria (Lungwort). There is a website I use called Wildflowers of the British Isles, http://www.ukwildflowers.com/index.htm which identifies Pulmonaria officinalis as having become wild by escaping from gardens.
I must admit to being obsessed with categorising things, but I fancy I might have bitten off a bit more than I can chew
with this as I suspect there may be grey areas where it is impossible to be precise.
I would be grateful for any thought s you may have on the subject?

I've seen Pulmonaria growing wild over a lot of northern Europe and always assume it is officianalis. In the UK it has naturalised from gardens.