I don't think this one is a British native so would doubt it being invasive. I found this reference which might be helpful.

https://www.researchgate.net/publication/289600144_The_medicinal_potential_of_plants_from_the_genus_Plantago_Plantaginaceae

It is Plantago major rosularis. Common name Rose plantain due to the rosette 'deformity'. the actual species P major isn't particularly invasive but it does seed freely and when it gets in the grass it isn't always easy to remove.
Seeds are available from Plant world seeds.

Well that's interesting! Have you seen one?

Not in the wild but in a physic garden. It has been documented since medieval times.

Thanks for the info everybody, not sure now whether to plant it or not though if it does get into the lawn it’ll have to fight the moss for space!
Stera, your link was impossible to read as it spread right across the width of the iPad screen and was then obliterated by colours etc on the website. Could you possibly send it again? Thank you.

I didn't save it - but all I did was put the plant name into Google and several links came up. If you can't find it from that let me know and I'll try again.