Marks & Spencer rebounds as JP Morgan sees Primark hit by heatwave footfall drop

JP Morgan says the UK retail split is driven by heatwave trading: higher UK temperatures produced a net benefit, with online clothing growth rising strongly even as physical store footfall fell. Marks & Spencer (MKS) and Primark/Associated British Foods (ABF) are positioned differently on this shift, implying uneven demand momentum across channels rather than a uniform sector move.

Analysis

The immediate market read is not about aggregate UK consumer strength; it is about channel mix and operating leverage. Retailers with digital penetration and flexible fulfillment can capture demand even when store traffic softens, while pure-store models see the weather tax hit fixed-cost absorption first. That creates a short-term relative tailwind for omnichannel apparel and a headwind for low-margin, high-footfall formats where conversion is highly dependent on physical visits.

The more interesting second-order effect is inventory risk. If warm weather extends, retailers can clear summer stock faster and reduce markdown pressure, but if the heat is transitory, demand is simply pulled forward from late summer into June/July, leaving September exposed to margin dilution. In that setup, the real losers are not just the obvious footfall-sensitive names but also suppliers and brands with higher exposure to discretionary apparel replenishment, since order volatility rises and wholesale restocking decisions get delayed.

For M&S/ABF, this is a relative-value story rather than a broad-beta one. M&S has more ways to monetize a weather-driven basket shift through online and higher-converting categories, while Primark’s model is structurally more exposed to store traffic and has less ability to recapture lost visits later. The risk is that the market has already priced the weather narrative into near-term trading updates; without follow-through in weekly data, the move can fade quickly. Over 6-18 months, the bigger issue is whether omnichannel share gains compound enough to matter to valuation, versus being dismissed as noise.

The contrarian view is that heatwave headlines often overstate incremental demand: consumers may just buy earlier, not more, and apparel is still the first category to get cut if the macro softens. If online growth is broad-based, the signal supports the channel winner thesis; if it is just a category or promo-led spike, then this is a tactical trade with limited durability. I would treat this as a short-horizon relative opportunity, not a thesis that justifies a large structural bet without follow-through in next trading updates.

Key Decisions for Investors

• Small tactical pair: long MAKSY / short ASBFY for 2-6 weeks, targeting relative outperformance if warm-weather footfall weakness persists and online conversion remains elevated; stop if store traffic normalizes or if next trading commentary shows no channel divergence.
• Watch-list only: initiate a long MAKSY position on any confirmed upgrade to full-price sell-through or gross margin guidance; the thesis fails if management cites promotional pressure or inventory cleanup in the next update.
• Avoid chasing ASBFY strength into the event window; if the stock rallies on a headline-driven weather trade without a corresponding trading statement, fade toward the next 1-3 month catalyst as the market usually reverts once temperatures normalize.
• Use UK retail footfall and weekly online traffic data as the catalyst check; if footfall rebounds within 1-2 weeks, cut any weather-sensitive relative position because the trade is likely fully mean-reverted.
• If available in the equity derivatives book, express the view with limited downside via a short-dated call spread on MAKSY rather than outright long, since the edge is tactical and the main risk is a quick reversal in weather and consumer basket mix.