Linear Leaves

Can anyone identify the strange plant growing from my garden?
A strange plant has sprung from my garden, right next to the house. It looks as though it will one day grow to be a budleia-sized shrub, has a reddish stem, large linear leaves (about 25cm long) of a medium to dark green, and beautiful flowers, growing each on its own stem straight out the top of the main stem (as it were). The flowers are delicate pink at the top, fading to white and yellow at the bottom, and are deep like an orchid’s (?) flowers, with stamen in the bottom of the bowl… They’re smallish for the size of the plant, only about 7 or 8 cm in diameter and depth… Does anyone know, from this rather odd description, what it might be? I live in the East of England, where the soil is sandy and well drained, and the plant is growing right by an east-facing wall
It sounds to me like you’ve got a policeman’s helmet or Himalayan balsam (Impatiens grandulifera), while it’s a very attractive plant and i’m very fond of the flowers, this is a very invasive alien species, it smothers riverbanks all over england, out competing natives. If you want to keep growing it and you’re a good distance from any bodies of water then just keep an eye on it, the seed pods actually explode(like the rest of the impatiens) to catapult their contents as far as possible, so be prepared to pull them ruthlessly next year.
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