Plant ID - Anyone Able To Help?

Have a look on tropica.com

could it be a Lobelia??

I think it looks like a hygrophilia. I thought there was a red version (because the one I used to have had red tints) . But this is the closest that I could find on the tropica site.
http://tropica.com/en/plants/plantdetails/Hygrophilacorymbosa(053BDT)/4490

I took mine out because it grew too quickly for me to keep up with the maintenance. As it settled into my tank the leaves became a lot more hardy (so don't be surprised if it drops all its flimsy leaves). When I took it out, the root mass was huge. It was really disruptive to my substrate!

Edit: quoted post split from topic into sticky thread by moderator Matt 

I have just been given a link to a plant 'bible' which is actually the catalogue for the supplier to maidenhead aquatics.  It is actually a great document with photos of each plant along with the conditions it needs and other information normally found on the label.  Super useful!!  :
 

http://aquafleur.com/AQ-catalogus-2017-UK-2-cont/HTML/files/mobile/index.html

Thanks for the suggestions and the link, folks. Having already kept many of the plants suggested, I knew that this plant was very different from anything I'd kept before. Having gone through the helpful link, I've now managed to identify it - it (or what's left of it) is definitely the Rotala Macrandra, and, furthermore, it came bunched at the bottom as per picture rather than in a pot. [It didn't come with an ID/care tag, so, if I'd known it was an advanced level of care, I might have thought twice about choosing it.]

The booklet gives me some consolation that many of the plants state that, due to being live decoration plants, "the lifespan is only a few months in an aquarium" - at least some of mine have actually achieved that, even if others have had significantly shorter lives.