Three things that could bring Starmer down - and what might save him

Prime Minister Keir Starmer is facing a significant leadership challenge driven by the potential publication of documents related to Peter Mandelson and ongoing investigations (including an HMRC probe into Angela Rayner). Immediate political tests include the 26 February Gorton and Denton by-election and the 7 May Scottish, Welsh and English council elections; poor results or damaging revelations could prompt backbench unrest, cabinet resignations or a drawn-out leadership contest, creating near-term policy and political uncertainty against the backdrop of the war in Ukraine and unpredictable US diplomacy.

Analysis

Market structure: Rising leadership risk in Labour raises a clear domestic-vs-global bifurcation: domestically exposed assets (FTSE 250, housebuilders, local banks) are losers while large-cap multinationals and commodity/service exporters (FTSE 100 heavyweights) are relative winners because a weaker sterling and risk-off flows boost dollar‑earnings and defensive cash flows. FX/gilt markets will price a premium into GBP and 10y gilts ahead of political catalysts; a 1–4% GBP move and 10–40bp gilt sell‑off are plausible in near‑term stress episodes.

Risk assessment: Tail risks include a forced Starmer exit or snap election (low prob but high impact) that could push GBP down 5–10% and 10y gilt yields up 50–150bp; immediate risk windows are the Mandelson documents (timing unknown), the Gorton/Denton by‑election on 26 Feb, and the 7 May elections. Hidden dependency: market direction will hinge on the perceived successor’s policy (centre vs left) which materially affects tax/regulatory expectations for energy, utilities and banks.

Trade implications: Tactical plays should be time‑targeted around Feb 26 and May 7: short domestically‑exposed equities and FTSE 250, buy GBP downside via options, and overweight FTSE 100 exporters as a hedge. Use option structures around the two catalysts to buy volatility rather than outright directional exposure; hedge portfolio duration with short gilt futures sized to limit portfolio DV01.

Contrarian angles: The consensus of sustained UK collapse may be overdone — if Starmer survives May the forced sell‑off could reverse 10–20% among domestics; additionally a weaker GBP mechanically lifts FTSE 100 EPS in GBP terms. Historical parallels (prolonged leadership angst that didn’t end governments) suggest entry points after decisive election outcomes rather than pre‑emptive averaging into positions.

Key Decisions for Investors

• Establish a 2–3% NAV short position in a FTSE 250 ETF (e.g., MIDD.L) or equivalent basket of domestic cyclicals (housebuilders, regional services) by 24 Feb; time‑horizon to unwind or re‑assess after 10 May, stop‑loss at 6% adverse move.
• Allocate 2–3% NAV long to FTSE 100 exporters via ISF.L or select names RDSA.L (Shell), ULVR.L (Unilever) as currency‑hedged upside if GBP weakens 3–5%; hold 3–6 months, target 6–12% upside or hedge if GBP recovers >3%.
• Buy GBP downside via options: purchase GBPUSD puts (or EUR/GBP calls) expiring ~10 May ~2–3% OTM sized ~1.5% NAV to capture volatility around the 7 May elections; take profits if GBP falls >2% or if implied vol rises >50% of entry.
• Protect UK housing exposure with June put‑spread on Barratt (BDEV.L) or Persimmon (PSN.L): buy ~5% OTM puts and sell ~10% OTM puts sized 1% NAV to cap cost; unwind or roll after May 7 depending on results.
• Hedge duration: enter a short position in 10y UK gilt futures equivalent to -0.5% NAV of portfolio DV01 ahead of major political dates (26 Feb–7 May); close position if 10y gilt yield rises >40bp or after post‑election volatility subsides.