A strike by technical staff in the BBC newsroom is threatening news coverage of the state opening of Parliament.
The State Opening of Parliament will be held on 15 November
Around 90 members of Bectu voted to stage a 24 hour walk-out from 10pm on 14 November over changes to their rota.
"We are targeting coverage of the state opening of Parliament and we are hoping to cause problems," said Bectu spokesman, Luke Crawley.
A BBC spokeswoman said the corporation was "disappointed" at the strike, but would "work towards zero disruption".
Affected programmes could include the major news bulletins at one, six and ten o'clock, as well as the rolling news channel, News 24.
Bectu's members are angry at the BBC after the length of their shifts was reduced, resulting in more days at work for many staff.
Around 95% of those balloted last week voted for strike action.
Further industrial action will be taken on 23 and 24 November, although Bectu has yet to announce what form it will take.