UK Stock Market Outlook: What to Know Before the FTSE 100 Opens on Monday 8 December 2025

The UK stock market heads into Monday’s open with the FTSE 100 sitting just below the 9,700 mark, energy and bank stocks under pressure, and a brand‑new consumer giant — The Magnum Ice Cream Company — about to start trading in London. Add in a looming US Federal Reserve rate decision, key UK GDP data later this week, and an ongoing reshuffle of FTSE constituents, and Monday’s session is set up to be busy even before the opening auction finishes.