Jac19 said: I was going to say maybe a Dropmore? I have a blue version of Dropmore, but I know a deep pink version exists.
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I live in west central Scotland - not where that photo is...
Def. Persicaria.
When you don't even know who's in the team
S.Yorkshire/Derbyshire border
Its a Persicaria.
Were you thinking of Lythrum virgatum Dropmore Purple?see my 1st pic
https://www.google.com/search?q="lythrum+virgatum+dropmore+purple"&tbm=isch&ved=2ahUKEwiljfzX66vzAhUMvBoKHYL3A84Q2-cCegQIABAA&oq="lythrum+virgatum+dropmore+purple"&gs_lcp=CgNpbWcQDDIECAAQHjIECAAQHjoECAAQQ1CLnAFYz_UBYMSKAmgAcAB4AIABb4gBrAOSAQMwLjSYAQCgAQGqAQtnd3Mtd2l6LWltZ8ABAQ&sclient=img&ei=v19YYeWxG4z4aoLvj_AM&bih=577&biw=1280&rlz=1C1CHBF_enGB785GB785
Cos that is not the mystery plant.
Mystery plant is Persicaria as mentioned by others.
maybe Persicaria affinis...see 2nd pic