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plant identification

Hello, can somebody help me identify the tall purple, salvia looking plants? thank you very much beforehand!
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When you don't even know who's in the team
S.Yorkshire/Derbyshire border
They flower for months if you cut back the old spikes and one of the few tall plants that I don't need to stake.
They do self seed very freely and seedlings come up everywhere - a welcome weed
Billericay - Essex
Knowledge is knowing that a tomato is a fruit.
Wisdom is not putting it in a fruit salad.