Thanks - I don't know which is worse labelling several different species as the same or
vice versa. I had quite a go at orchids last year, mostly succesfully except, as you say, for those odd ones that are anyone's guess.
Some variations are quite weird:
versus

I spent a lot of time with these trying to work out whether the differences had something to do with fertlisation or whether the flower had been accidentally damaged &c &c....