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Hoary plantain (P. media) has leaves "mostly in a flat rosette on the ground" - which is not terribly helpful - but also each leaf has a short stalk.
P.major has leaf stalks "as long as leaves".
P. media, and I didn't know this until I looked it up, is the only insect-pollinated Plantain, so the flowers are scented. Ribwort and Hoary are wind-pollinated, so there is no need for their flowers to have any scent.
Fascinating stuff, eh?!
How to take close-ups with cheap phone and hand-lens:
Field Guides for Budding Botanists:
Basically, Hoary Plantain is a much more delicate plant, with a slight white hoar over the smaller, neatly-rosetted leaves and with shorter, whitey-pink, attractive flowerheads.
In other words, Hoary is rather attractive, while Greater is an ugly brute.
My Flickr photos...
Lat/Lng: 51.8044, 0.4113
OS grid ref: TL663145