Thank you Mike R for this information:
Himalayan Balsam (Impatiens glandulifera)
I wonder if any other residents of Parwich have found this plant in their gardens. This year for the first time I have found an abundance of this weed in our gardens at Flaxdale. I have not been aware of it before now. It grows in height at an astonishing speed, about an inch a day.
Wikipedia describes it as follows… “It typically grows to 1 to 2 m (3.3 to 6.6 ft) high, with a soft green or red-tinged stem, and lanceolate leaves 5 to 23 cm (2.0 to 9.1 in) long. The crushed foliage has a strong musty smell. Below the leaf stems the plant has glands that produce a sticky, sweet-smelling, and edible nectar. The flowers are pink, with a hooded shape, 3 to 4 cm (1¼ to 1½ in) tall and 2 cm (¾ in) broad; the flower shape has been compared to a policeman’s helmet.
After flowering between June and October, the plant forms seed pods 2 to 3 cm (¾ to 1¼ in) long and 8 mm broad (¼ in), which explode when disturbed, scattering the seeds up to 7 metres (23 feet).” (see https://en.m.wikipedia.org/wiki/Impatiens_glandulifera )
It was highlighted as a nuisance on the East Midlands evening news recently. Whenever I see it in the garden I pull it up and compost it before the seed pods form.
I would be interested to know of anyone else’s experience with this invasive weed and whether I am doing the correct thing.
Mike R
The above plant was photographed in a Creamery Lane garden this July. It went from less than a foot tall to full flower in just over three weeks. It is particularly problematic along water courses, where it’s rapid growth quickly smothers native plants.
PARWICH.ORG 
The plant photographed in the post was in my garden. I saw it less at than a foot tall, just before I went away, but was not sure what it was. Three weeks later it was well over a metre tall and in full flower.
I had assume it had been introduced into the garden with some horse manure (not locally sourced), however Mike’s experience suggests it is more widespread locally.
Like Mike, I composted it, but because some immature seeds pods were present, I plan to bury the resultant compost quite deep.
Shame it is such a thug. I used to love exploding the seed pods as a child and it has pretty flowers. However where it gets out of control it is a nightmare.
Funnily enough, saw this at Cromford Canal at the weekend, growing along the water’s edge. I thought it was some sort of wild sweet pea, but was corrected that it was Himalayan Balsm. https://www.rhs.org.uk/advice/profile?pid=480
You might think about spraying your nuisance plant with a herbicide that kills the thing including the root. There are several on the market. Good luck