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Is the context on BBC World news at 10pm?  It’s only been on for 30 mins on the news
Channel?

U.S. has already shifted to summer time, so World News America has to go on air an hour earlier, at 21:00 UKT. This shifts the Context for this week to 21:30-22:30 UKT. This is not a unique situation, it happens every half a year (in the autumn United States dips out of summer time later , so once again for a week or two WNA shifts back an hour in relation to European clocks).