Written by Lilin Lu
Illustrated by Sylvain Chan
For international students and migrants in the UK, English proficiency is often a prerequisite for study, work, or residence. In this context, the structure of the private English Language Teaching (ELT) market is not abstract. This article focuses on the private ELT sector serving non-English native speakers and does not address university-based language centres or credit-bearing language provision, which operate under different language institutional incentives.
Private English Language Teaching (ELT) in the UK increasingly operates as a highly commercialised market, in which quality is difficult to observe, outcomes are hard to verify, and providers face strong incentives to market rather than teach. Under these conditions, mediocrity is not an aberration but a predictable outcome.
The scale of the market is striking. According to industry estimates, the UK’s English language teaching sector generated close to £1 billion in revenue in 2024, supporting around 40,000 jobs nationwide. Broader impact studies place its total contribution to gross value added at nearer £2 billion once indirect effects are included. This is not a marginal industry operating at the fringes of education, but a significant export sector, sustained largely by overseas demand and international mobility.
Such a lucrative industry inevitably creates strong incentives for intermediaries. Alongside teaching provision, a parallel ecosystem of agents and marketing firms has emerged to link overseas students with destination schools, often exerting greater influence over enrolment decisions than instructional quality itself. Visibility, promotion, and brand presence frequently matter more at the point of recruitment than demonstrable educational outcomes.
Language education is unusually difficult to evaluate. Unlike most services, its quality cannot be assessed in advance, and progress remains ambiguous even after instruction has begun. Students typically pay upfront, while improvement depends on a combination of teaching, exposure, time, and individual aptitude. Improvement may reflect classroom teaching. It may just as plausibly result from immersion itself, daily exposure, informal interaction, and the necessity of communicating in English outside the classroom in an English-speaking country. Language acquisition rarely occurs in isolation, which makes it difficult for students to attribute outcomes to instruction rather than the environment.
Economists describe such services as credence goods: markets in which sellers know more than buyers, and where competitive pressure tends to operate on presentation rather than performance. In such settings, accountability is inherently weak.
This ambiguity extends to the classroom itself. Fluency in a language does not automatically confer the ability to teach it, yet screening and pedagogical training requirements across the sector appear uneven. Class sizes vary widely, individual feedback is often limited, and instructional quality is difficult for students to benchmark. When progress falls short, learners face an impossible counterfactual: was the teaching ineffective, or was improvement slower for reasons unrelated to instruction? In practice, this uncertainty insulates providers from meaningful scrutiny.
Marketing practices illustrate how these incentives operate. In one instance, a language-school agent offered a free trial lesson at a London school in exchange for a short, paid promotional video. According to subsequent clarification, the school itself was unaware of the specific incentive offered by the agent. After the lesson, this was followed by a contract granting the agency perpetual rights to edit and reuse the footage, alongside a waiver of legal claims over its use.
The transaction is revealing not because it is deceptive, but because it substitutes visibility for verifiable quality. Regardless of whether the incentive originated with the school or the intermediary, the arrangement reflects a market structure in which promotional material can be manufactured independently of demonstrable educational outcomes.
Such arrangements are not unusual in markets targeting prospective language learners. They reflect a system in which reputation is built through visibility, sometimes actively incentivised, rather than verified educational outcomes, and where value is extracted in ways that students cannot easily assess in advance.
None of this requires bad intentions. It merely requires a market in which financial incentives are clear, accountability is not, and the costs of failure are borne elsewhere. As the demand for language education is sustained not only by educational ambition, but also by immigration rules and credential requirements, it reduces the scope for consumers to exit or discipline poor provision. Under such conditions, mediocrity is not punished. It is absorbed.
The implications extend beyond language schools. Similar incentive structures increasingly appear at the margins of higher education, where credentials matter more than instruction and where students bear most of the downside when expectations are not met. When education is organised as a market under conditions of opaque quality and credential-driven demand, commercialisation can advance far more reliably than effectiveness.
The problem, then, is not bad teaching or unmotivated students. It is a system in which enrolment and marketing are rewarded immediately, while learning remains slow, uncertain, and difficult to measure. When education behaves like a promise rather than a product, the risk does not disappear. It simply shifts.
