Strokes are a known side-effect of the experimental covid gene therapy shots as of 2020, before the emergency use authorizations. Calling strokes an "unrelated illness' is dangerous disinformation from BBC.
Sources:
https://www.bbc.com/news/uk-england-coventry-warwickshire-57234741
FDA Video(with timestamp): https://youtu.be/1XTiL9rUpkg?t=9220
FDA Document: https://www.fda.gov/media/143557/download