Once this week's Bank of England decision is out of the way, the FTSE 100's next big macro test arrives at 7:00am on Thursday 12 November, when the ONS publishes its first estimate of UK growth for July to September.

After the Bank, the economy

This week is packed with market-moving events for London's FTSE 100: the US midterms on Tuesday, eurozone Inflation on Wednesday, the Bank of England on Thursday and US payrolls on Friday. It is easy to look no further ahead than that.

But the following Thursday brings a release that could matter just as much for how investors judge the UK. At 7:00am on 12 November, the Office for National Statistics will publish its first quarterly estimate of gross domestic product for July to September 2026. It will be the first official snapshot of how the economy fared over the summer quarter.

The timing is significant. If, as widely expected, the Bank of England raises Bank Rate from 3.75% to 4% on 5 November, the GDP figures will be the first major piece of domestic data to land after that move. Markets price the rise at around 95%, and it would be the first hike in more than three years. The growth numbers will therefore shape how investors judge whether the Bank tightened into strength or into a slowdown.

What follows focuses on why the release matters rather than what it might show.

The questions the data will answer

Is the economy solid enough to absorb higher rates? The Bank's hawks have been arguing for tighter policy since the summer. Megan Greene, Huw Pill and Catherine Mann voted for a hike at the June, July and September meetings. A solid GDP print would support their view that the economy can handle higher borrowing costs. A weak one would raise questions about whether further rises are wise.

Does the survey data line up with the official figures? The UK Manufacturing PMI rose to 52.8 in October from 51.9 in September, a five-month high. Surveys are timely but imperfect. The ONS estimate offers harder evidence, albeit for an earlier period, and markets will compare the two.

How does growth sit alongside inflation? UK inflation rose faster than expected in September. Market watchers have flagged that a key watch point for the Bank's decision is whether its new forecasts show inflation topping 4% early next year. If GDP data shows solid growth at the same time, the case for a February follow-up — which economists see as more likely than not — would strengthen. Soft growth alongside sticky inflation would leave the Bank in a far more uncomfortable spot.

Where GDP data bites inside the FTSE 100

Several of the FTSE 100's largest members are international businesses, which can blunt the impact of UK data at index level. But a sizeable group of domestically focused companies is far more exposed, and several of them have been in the spotlight this week.

Housebuilders and home improvement names rallied on Monday 2 November. Barratt Redrow (LSE:BTRW) rose 3.5%, Howden Joinery (LSE:HWDN) climbed 3.9% and Kingfisher (LSE:KGF) gained 4.21%. The FTSE 350 construction and materials sector added 2.8%. No company-specific news was reported for Kingfisher, and reports tied the broad rally in consumer and construction stocks to lower oil prices. Barratt Redrow updates the market on Wednesday 4 November and Howden on Thursday 5 November.

Retailers are another domestic barometer. JD Sports Fashion (LSE:JD.) was the FTSE 100's top riser on Monday, up 4.76%, again without any company-specific news reported. Marks & Spencer (LSE:MKS) reports half-year results on Wednesday, with analysts saying the retailer is expected to show a return to profit growth after the 2025 cyber attack. Next (LSE:NXT) issues its Q3 trading statement on Thursday; in August, it raised full-year pre-tax profit guidance by £25m to £1.24bn.

BT Group (LSE:BT.A), which reports half-year results on 5 November, is another Business closely tied to the UK. It aims for about £3bn of annual free Cash Flow by the end of the decade, roughly double today's level.

These company updates will give an early read on consumer and housing Demand before the official numbers arrive. If trading statements this week point one way and GDP data points another, the FTSE 100's domestic names could be in for a choppy few days.

Illustration: imagine a hypothetical economy with quarterly output of £600bn. Growth of 0.2% would add £1.2bn in a quarter, while growth of 0.5% would add £3bn. A contraction of 0.1% would subtract £0.6bn. These figures are purely invented to show scale and are not estimates of UK GDP.

There is one further complication. The 12 November release coincides with a busy ex-dividend day. Shell (LSE:SHEL), GSK (LSE:GSK), Unilever (LSE:ULVR), Bunzl (LSE:BNZL), Sainsbury's (LSE:SBRY) and Pershing Square Holdings (LSE:PSH) all go ex-dividend that day. When shares trade without their Dividend entitlement, prices typically adjust downwards, which can weigh on the index mechanically. That could make it harder to isolate the market's reaction to the GDP data.

Key dates to watch

  • Wednesday 4 November: Barratt Redrow trading statement; M&S half-year results
  • Thursday 5 November: Bank of England rate decision, with a rise to 4% from 3.75% widely expected
  • Thursday 5 November: BT half-year results; Next Q3 trading statement; Howden Joinery Q3 trading statement
  • Thursday 12 November: UK GDP first quarterly estimate for July to September, 7:00am
  • Thursday 12 November: Ex-dividend dates for Shell, GSK, Unilever, Bunzl, Sainsbury's and Pershing Square

The bottom line

The Bank of England decision dominates this week, but the 12 November GDP release is where the FTSE 100 will discover whether the economy can bear tighter policy. Domestic stocks such as housebuilders, retailers and BT are most exposed to the answer, while overseas earners at the top of the index should be less directly affected. Investors will be watching how the summer quarter's numbers fit with this week's trading updates and the Bank's new forecasts.