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Avoiding trade mark infringement in the aftermarket: lessons from the AGA case

Posted on 13 January 2026

Reading time 6 minutes

In brief 

  • Under UK trade mark law, trade mark rights are said to be exhausted when goods have been put on the UK/EEA market under that trade mark by the trade mark owner or with their consent. However, the relevant rights will not be exhausted where there exist certain legitimate reasons for the trade mark owner to oppose further dealings in the goods. 
  • In this case concerning renovated and converted AGA cookers, the Court of Appeal has upheld the first-instance finding that UK Innovations Group Ltd had infringed AGA's trade marks, specifically through the way in which it had marketed and sold its cookers (as opposed to its acts of refurbishment and conversion). In particular, the use of the composite term "eControl AGA" created the impression of a commercial connection with AGA. 
  • Businesses operating in aftermarket and refurbishment sectors should review their marketing materials to avoid creating potentially misleading impressions as to whether they are commercially connected to the original manufacturer. In particular, using composite signs incorporating a third party's trade mark may suggest co-branding or endorsement by the trade mark proprietor. 

Background 

UK Innovations Group Ltd took old AGA cookers, renovated them and converted them to run on electricity using its proprietary eControl System. AGA Rangemaster Group Ltd successfully brought High Court proceedings, for trade mark and copyright infringement. UKIG argued that, since the goods had previously been put on the market by AGA, AGA's rights were exhausted, which would provide a defence to allegations of infringement of AGA's registered trade marks. However, the way in which UKIG marketed the refurbished cookers created the impression of being commercially connected to AGA, which meant that the exhaustion defence did not apply to those activities. 

The Court of Appeal's decision, handed down on 15 December 2025, upheld the finding that the way in which UKIG had marketed its cookers created the incorrect impression of a commercial connection between UKIG and AGA. This judgment offers important guidance on the limits of the exhaustion defence under section 12 of the Trade Marks Act 1994 (TMA) and demonstrates how marketing practices can undermine otherwise legitimate aftermarket activities. 

Court of Appeal decision 

Exhaustion defence 

A registered trade mark is not infringed by the use of the trade mark in relation to goods which have been put on the market in the UK or EEA by the trade mark proprietor or with their consent. However, the exhaustion defence does not apply where there are legitimate reasons for the proprietor to oppose further dealings in the goods (section 12 TMA). 

The effect of section 12 TMA is to provide a defence on the basis that the rights conferred by a trade mark are exhausted once goods have been sold by the proprietor or with their consent, enabling the proprietor to realise the economic value of the mark. However, as the Court of Appeal's judgment emphasises, this defence is not absolute and the trade mark proprietor can object to further dealings in those goods where there are legitimate reasons to do so. 

There are three broad categories of situations that have been accepted to constitute legitimate reasons to oppose further dealings: 

  1. where the condition of the goods has been changed or impaired; 
  2. where further dealings might seriously damage the reputation of the mark; and 
  3. where the dealings give the impression that there is a commercial connection between the defendant and the trade mark proprietor. 
UKIG's grounds of appeal 

UKIG appealed the High Court's decision on two grounds, namely that: 

  1. the judge erred in applying the "with difficulty" test (see below); and 
  2. the judge's findings of fact were rationally unsupportable. 

The "with difficulty" test 

The High Court judge had held that the legal test was that AGA must show that customers would be unable, or would be able only "with difficulty", to ascertain whether the refurbished cookers originated from AGA or from a third party. However, this test was derived from cases concerning keyword advertising and was not applicable to this case. Nonetheless, the Court of Appeal found that, although the judge had referred to this test, he had not applied this less stringent test when making his findings. 

Rationally unsupportable? 

The Court of Appeal also held that the judge was entitled to conclude that composite terms like "eControl AGA" or "AGA eControl" were likely to indicate to customers that the cooker was a product in AGA's range, particularly since some AGA products have a model named in a similar way, such as the AGA eR7 model. The court refused UKIG's suggestion that there was no other way to refer to the converted product and found there was nothing necessary or inevitable about the use of a single composite label (such as "eControl AGA" or "AGA eControl"). The fact "eControl" was the name UKIG gave its system did not mean there was an unfettered right to use that word alongside AGA in that way. This ground of appeal was, therefore, also unsuccessful. 

Copyright infringement 

There was also a dispute about whether UKIG had infringed copyright in AGA's design drawings by making control panels reproducing those drawings. The High Court held that the design drawing was an original drawing and protected by copyright, and it had been indirectly copied by UKIG. However, UKIG had a defence under section 51 of the Copyright, Designs and Patents Act 1988 (CDPA) because the article made to the design (i.e. the control panel) was not, itself, an artistic work. 

AGA cross-appealed against this finding arguing that the control panel was a graphic work (i.e. an artistic work) and that section 51 CDPA was incompatible with assimilated EU law. The Court of Appeal dismissed the cross-appeal and upheld the High Court's finding that the control panel, viewed as a whole, was primarily a functional object, not a graphic work. In light of that, the issue of compatibility with EU law became a purely academic one and the court declined to deal with it (whilst this approach flowed from the court's finding, it is disappointing not to have the Court of Appeal's view on this complex issue). 

Practical implications 

This decision reinforces several important principles for businesses operating in aftermarkets and refurbishment. As the Court of Appeal's decision demonstrated, whilst businesses are entitled to refurbish, modify and resell trade-marked goods that have been put on the market with the proprietor's consent, they must take care not to create the impression that their modifications or additions are connected with or endorsed by the trade mark proprietor. 

In particular, businesses seeking to advertise and market their refurbished products should take care to avoid confusing customers as to the origin of the product. They should carefully review their marketing materials to avoid the risk of trade mark infringement (or other infractions, e.g. of the Advertising Standards Authority codes). 

Further, marketing goods using composite marks (for example "eControl AGA") should be approached with care, as this may be perceived as co-branding. 

Precision in marketing matters. The exhaustion defence provides important breathing space for legitimate aftermarket activities, but it does not allow traders to blur the lines and create confusion between their own products and those of the original manufacturer. 

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