Retail Dive reported on 29 September 2026 that Sephora will open shop-in-shops in 100 Marks and Spencer stores from spring 2027. Source: https://www.retaildive.com/news/sephora-marks-spencer-uk-beauty-retail-shop-in-shops/831603/. Global Cosmetics News reported the partnership on 30 September.
The reported context: the UK beauty market sized at around $7bn growing 1.2% in the twelve months to 19 July, with M&S holding over 1% share. Global Cosmetics News puts the UK market at £5.2bn and M&S share at 1.3%.
The detail that makes this instructive is the comparison Retail Dive draws. Sephora has run the same format in the US with Kohl's since 2020, and that partnership is now described as a drag on Kohl's results.
Same operator. Same format. Opposite assessment.
The format depends entirely on the building
A shop-in-shop does not generate its own footfall. It captures a share of the footfall that the host retailer already has.
That is the whole economic proposition. The host has customers walking in for other reasons, and the beauty concession converts some of them. It is a very efficient model when the host is healthy, because the traffic is already paid for.
It is a poor model when the host is not. A beauty concession inside a retailer whose own customers are visiting less often does not fix the footfall problem. It inherits it. The products can be right, the fit-out can be good, the brand can be strong, and the fundamental input, people walking past, is simply smaller than planned.
This is why the Kohl's comparison is more useful than the M&S announcement. It demonstrates that the format is not the variable. The host is.
What this means for a brand being offered concession space
Brands at £500k to £5m get offered this kind of arrangement more often than they get offered national listings, because the commitments are smaller and the decision sits lower in the organisation. Concessions, shop-in-shops, department store counters, curated bays inside larger retailers.
The pitch is always framed around the beauty opportunity: the category is growing, the retailer is investing, the space is prominent, here is the footfall of the centre.
What is almost never discussed is the trajectory of the host's own business, and that is the thing that determines the outcome.
The diligence that takes an afternoon
Before signing any host-dependent retail deal, find three things.
Like-for-like or comparable sales for the host retailer over the last two years. This is public for any listed retailer and usually reported in trade press for private ones. Falling comparable sales mean existing stores are selling less, which generally means fewer people in them.
Footfall trend, which for UK retail is widely reported by centre and by chain. A beauty concession in a declining centre is a bet that you will take a larger share of a shrinking number.
And whether the host is opening or closing stores. An estate under review is a signal that the location you are offered may not exist in three years, which matters a great deal if you are funding a fit-out.
If all three are negative, the beauty proposition does not rescue it. Decline politely and keep the stock.
Why M&S is a different proposition
The reported figures explain the logic. M&S holds somewhere between 1% and 1.3% of a UK beauty market worth £5.2bn to $7bn. That is a small share in a large market, held by a retailer with substantial existing footfall and genuine category credibility in adjacent areas.
A low share in a big market with traffic already in the building is close to an ideal setup for this format, because the growth does not depend on bringing new people in. It depends on converting people who are already there and currently buying beauty somewhere else.
That is a very different proposition from a format that needs to reverse a decline in visits.
The read-across for your own distribution
The general principle is worth separating from this specific deal, because it applies to several decisions a small brand makes.
Any channel where you depend on someone else's traffic is a bet on that traffic. A concession depends on the host's footfall. A marketplace listing depends on the marketplace's visits. A retailer listing depends on that retailer's customers. A creator partnership depends on that creator's audience continuing to show up.
In each case the quality of your product affects your conversion, and the health of the partner determines your ceiling. Founders spend almost all their diligence on the first and almost none on the second.
The fix is a habit rather than a project: before committing stock, cash or a fit-out to anyone else's traffic, spend an hour finding out whether that traffic is growing or shrinking.
The plain version
Sephora is running the same format in two markets and getting a very different reception, and the difference is the host.
If someone offers you concession space in the next six months, the beauty opportunity is not the question to spend your time on. Whether their customers are still coming through the door is.