To the woman who was groped at LBG platform 7 at about 22.30 last night
I hope this post finds you.
I'm the person who witnessed it and shouted down the train at the perpetrator.
I reported it to BTP via 61016. I left more information today during a phone call with them.
If you want to make a report, I have told them I would help in whatever way I can. I can't take it further since I am just a witness.
I hope you are ok. If you want to reach out, DM me and please include a rough description of you and the party you were with so I know it's you.
Best wishes.
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I hope that it's OK for me to post this here. r/London removed it when I tried to post it there.