Polling is under way in the Holborn and St Pancras byelection, where voters are choosing a successor to Keir Starmer. Starmer said last month that he would stand down as the constituency's MP.
The contest returns attention to a central London seat previously represented by the prime minister, with the result set to determine its next voice in the House of Commons.
Separately, a report by the Transition Security Project has questioned the balance of Britain's defence priorities. The researchers argue that the UK military is more oriented towards overseas commitments than other European forces, potentially limiting attention and resources for domestic defence.
According to The Guardian's live political coverage, the report estimates that almost a quarter of the UK defence budget is directed to commitments spanning five continents. It warns that a planned rise in defence spending could add to inefficiency if the underlying allocation of resources is not reconsidered.