I'd like to be wrong, but I suspect that outside of people who are already in the labour movement, nobody will be talking about this next week let alone the next election. How much of a role did SDS play at the last election, when that was already known about?

It's been ""known"" for years that Special Branch helped murder people in Northern Ireland, and outside the republican community and the small subset of mainland "left" that pays attention, it makes no difference.

https://www.belfasttelegraph.co.uk/opinion/news-analysis/how...

(Far too many of the "british people" read rightwing press outlets which will minimise this and some other issue, probably Brexit, to rile up their readers to demand more not less authoritarianism)