Whats English Gardens?
No offense or anything but it is highly doubtful you obtained N. lavicola, N. longifolia, or N. angasanensis from a garden center.
Most likely what you have is N. x Ventrata or perhaps N. alata
Perhaps if you can post a picture in a new thread we can help identify your plant. Even then it is sometimes impossible to be certain when identifying an unlabelled plant from a nursery.