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Adding to what others said, they can just let UK block Wikipedia, but as a foundation that tries to share knowledge I think they're obliged to try avoid that. So they're doing just that right now, by challenging the law.

Wikipedia's "gone black" before: https://en.wikipedia.org/wiki/Protests_against_SOPA_and_PIPA..., IMO blocking access to the whole of UK would've been a big move that could've been effective.

They presumably have editors in the UK, foundation members who live or work or travel there

they would at least want to block the UK from accessing it first?

Because some of Wikipedia's editors are based in the UK.