Judging by how small it is (and how compact) and the other stuff Yug mentioned, it most likely is an SDC. Since you live in England that's probably the most common variety sold anyway, as most people would have to grow them indoors as houseplants, which SDC are commonly used for. It looks really healthy though, and would benefit from a little potting up
Congrats on getting more into the banana craze; those Velutina and Sikkimensis seedlings now have some motivation to get bigger and catch up
