What Is It?

Question

You are the last on my list having posed this Q on several sites including f.b.
Found this along a woodland trail around our local reservoir
the following week it had disappeared completely as if it had never been there.
Pretty sure it was not a UK natural or even a garden escapee
Quite large approx 20cm flower spike, no scent to speak of,large banana type leaves, about 1.5m high with plenty of growing still to go.

Answer 1

I have answered this on the other question that you have posted with the image. Thanks!

Answer 2

Thank you so much, it is a first for me despite all the rummaging around the undergrowth I've done over the years.