National Grid shares fell 0.7% to 1,203.5p in London on Monday, trailing the FTSE 100 after Prime Minister Keir Starmer announced his resignation. The stock traded between 1,193.5p and 1,215.5p by midday, giving back 39.5% of Friday’s bounce. Britain’s 10-year gilt yield hovered near 4.85%, pressuring utilities seen as bond alternatives. National Grid last reported £44.2 billion in net debt.