Used hybrid stock is closing on 100,000 cars

Used hybrid stock in Britain reached 99,237 cars in September, the highest monthly total MarketCheck has recorded and 763 vehicles short of the 100,000 mark. The same series put the market at 43,575 cars in May 2023, which makes this a market that has added 55,662 cars, or 127.7%, in a little over three years.

A milestone is easy to report. The useful question is what a near doubling of supply does to the price you pay and the choice you get. On both counts the answer is more interesting than the record itself.

The shape of the rise

The trend is up, but it has not been a straight line. MarketCheck's monthly figures show 92,886 hybrids advertised in January, a record of 98,676 in March, a summer slide to 93,332 in August, then September's jump to 99,237. That pattern, a spring high followed by a soft summer and an autumn recovery, is what a maturing market looks like rather than a glut arriving all at once.

Year on year the rise is 19,243 cars, or 24.1%, against the 79,994 advertised in September 2025. Two years earlier, in September 2024, the figure was 67,794.

The supply was created well before it appeared on forecourts. Hybrids sold new in 2022, 2023 and 2024 in growing numbers are now passing the three-year mark, the point at which a large share of PCP and company cars come back to the trade. The used market as a whole has been expanding alongside it: 7,807,872 cars changed hands in 2025, up 2.2%, and hybrid transactions rose 28.6% to 407,531, or 5.2% of the market.

Demand has kept pace so far

Supply rising quickly is only a problem if buyers do not turn up. The transaction data says they have. In the second quarter of 2026, used hybrid sales rose 31.2% to 130,825 cars, lifting their share of the 2,009,318-car market to 6.5% from 5.0% a year earlier.

A rough cross-check is worth doing, provided you treat it as rough. Those 130,825 quarterly sales work out at about 43,600 a month. Against 99,237 cars advertised, that is roughly ten weeks of stock sitting on forecourts. The two datasets come from different samples and count different things, one transactions and one adverts, so the number is a sanity check rather than a measurement. It does suggest a market carrying more choice than it did, without a pile-up that nobody is buying.

That helps explain what has happened to values.

Values are easing, not collapsing

Solera cap hpi's October read put hybrid values down 1.8% at three years and 60,000 miles, in a market that fell 1.7%, or about £350. Petrol fell 2.2%, diesel 2.6% and plug-in hybrids 1.9%, while battery electric cars rose 0.6%.

So a used hybrid lost slightly more than the average car in October and slightly less than a petrol or diesel equivalent. That is what more supply looks like at the margin. It is not a collapse, and the year-to-date picture is milder for hybrids than for the fuels around them: plug-in hybrids are down 9.9% across 2026, petrol 8% and diesel 11.7%, against 4.7% for battery electric cars.

Chris Plumb, head of current car valuation at Solera cap hpi, described a trade that is still buying but pricing defensively. "Buyers are still active at auction, but they're being more selective about what they purchase and how much they're prepared to pay," he said. "Cars are selling, although vendors are having to be more realistic about prices."

For anyone selling a hybrid privately, that is the sentence to read twice. The car will sell. The question is whether the asking price was set against last year's market or this one.

The plug-in half is a different market

The headline number covers hybrids as MarketCheck counts them, and that grouping hides a split that matters to buyers. Conventional hybrids are the ones piling onto forecourts. Used plug-in hybrid transactions actually fell in the second quarter, down 6.8% to 22,856 cars and 1.1% of the market, from 1.2% a year earlier.

The new car market is running the other way. Plug-in hybrid registrations rose 55.5% to 59,571 in September, a record 17.0% share, according to the SMMT's September registration figures. Those cars will reach the used market around 2029 and 2030 at three years old. The plug-in supply wave has not started yet, which is worth knowing if you are waiting for used plug-in prices to fall further.

Values already tell part of that story. Plug-in hybrids have lost 9.9% across 2026, more than any powertrain except diesel. A buyer gets the discount. A seller carries it. And a plug-in only delivers its running-cost case when it is charged regularly, a point we made in our look at hybrid sales this year.

What it means on the forecourt

For a buyer, 99,237 advertised cars is bargaining power. Specification and colour are findable, and a dealer holding a car that has been in stock for weeks has a reason to talk. Ask for the battery health check and the date it was done, not a verbal assurance, and ask what manufacturer battery cover remains. Toyota's UK hybrid page says its battery cover can be extended by a year or 10,000 miles with each qualifying service, up to 15 years from registration, which is a meaningful difference on a five-year-old car and none at all on one that has been serviced elsewhere.

It also helps to know which kind of hybrid you are buying. A self-charging hybrid has no cable and no charging habit to learn. A plug-in needs to be plugged in to justify its price premium, and its battery is doing far more work.

For a seller, the October values are the message. Hybrids are holding up better than petrol and diesel, and worse than they did a year ago. A car priced from a current valuation will move. One priced from memory will sit.

The 100,000 mark itself is close. August's 93,332 to September's 99,237 is a rise of 5,905 in a month, and the autumn months are usually the strong ones before December softens. Whether the threshold is crossed in October or November is a detail. That the used hybrid market now carries six figures of choice, after sitting at 43,575 three years ago, is the change that will shape what buyers pay.

Our October read of used values covers the fuel-type split in more detail, and the used electric price gap sets out where battery cars sit against their petrol equivalents.