ASA Bans Thomas Cook, Loveholidays and DialAFlight Ads Over Vague 'Eco' Hotel Claims
The UK's Advertising Standards Authority has banned ads from Thomas Cook, Loveholidays and DialAFlight for calling hotels 'eco' without evidence — a signal that unqualified green claims in travel now fail by default.
What the ASA actually ruled
On 9 September 2026 the Advertising Standards Authority upheld complaints against three of the UK's best-known travel sellers. Loveholidays had promoted a "Green Garden Eco Resort" and a "Marvida Family Eco Hotel"; Thomas Cook advertised a "Sandos Caracol Eco Resort"; and DialAFlight ran a Meta ad for an "eco-conscious resort". The ads appeared across Google and Meta in July 2026.
In each case the regulator found the word "eco" was used without evidence to substantiate the environmental benefit it implied, and told the brands not to repeat the claims in their current form. ASA director Miles Lockwood said advertisers must "be clear about what [eco] means, so people have the information they need to make an informed choice."
Why 'eco' is now a default-fail word
This is not a one-off. It is the latest move in a multi-year ASA push against unqualified environmental claims, and it hardens a pattern brands can no longer treat as an edge case. Our read: words like "eco", "green", "sustainable" and "conscious" have crossed from persuasive shorthand into regulatory red flags when used bare. The burden of proof sits entirely with the advertiser.
Travel and hospitality are especially exposed, because "eco" is often anchored to a single feature — towel reuse, solar water heating, a local-sourcing policy — that then gets stretched into a whole-resort halo. The gap between what a hotel does and what the word implies is exactly where a complaint lands.
What marketers should do now
Three practical moves follow. First, audit every live paid-search and paid-social execution for bare eco/green/sustainable language. Second, attach specifics wherever the term stays: name what is certified, by whom, and what proportion of the operation it actually covers. Third, if you cannot substantiate a claim inside the ad's limited space, link out to a claims page — or drop the word entirely.
There is an upside to this discipline. Specific, evidenced claims — a named certification, a measured reduction, a concrete practice — tend to be more persuasive than a vague adjective, because they give a sceptical consumer something to believe. Compliance and conversion pull in the same direction here.
A simple filter we use with clients is the three-question eco-claim test: Can you name it? Can you prove it? Does it cover the whole product, not just one corner of it? If any answer is no, the honest move is to qualify the claim or cut it.
Quick FAQ
Which brands did the ASA ban ads for over 'eco' claims?
Thomas Cook, Loveholidays and DialAFlight, in rulings published on 9 September 2026, for describing hotels or resorts as "eco" without evidence to back the environmental benefit implied.
Is it against the rules to call a hotel 'eco' in UK advertising?
It is not illegal, but under the CAP Code you must hold evidence for the environmental benefit implied and make clear what "eco" covers. Without that, the ASA can rule the ad misleading and ban it.
How can brands make green claims safely?
Use specific, verifiable detail — the certification, its scope, and the proportion of the product it applies to — rather than unqualified words like "eco" or "green" on their own.
'Eco' has quietly become one of the most dangerous words in a marketer's vocabulary. Not because sustainability doesn't sell — it does — but because a bare green label now reads as a claim you can't back. Say exactly what you did, and let the specifics do the persuading. — Daniel Nikolla, Founder of Merx Marketing
Unqualified green words are now a compliance risk, not a creative flourish — if you can't name it and prove it, don't say it.
How is your brand evidencing its sustainability claims in paid media — and would they survive an ASA complaint?
If you would like to know more about this topic, please contact us on danieln@merxmarketing.co.uk
Sources: DecisionMarketing, The Irish News, BritBrief.
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Written by Daniel Nikolla, Founder of Merx Marketing Ltd and Marketing Minute
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