When a teacher is absent, the lesson should not be. Continuity, not supervision.
For the deputy head at 7:42am, the cover coordinator with a half-empty rota, and the teacher walking into a classroom that isn't theirs.
A digital handover platform. Lesson, seating plan, SEND notes, behaviour policy, safeguarding briefing. On any device. In under two minutes.
A problem documented thoroughly. Solved poorly.
In the average secondary school, at least one teacher is absent every school day. The pupils in that classroom are not taught — they are managed. Six findings, each independently evidenced, establish why that distinction matters and what it costs.
Teacher absence has not returned to pre-pandemic levels.
In 2023/24, two-thirds of teachers took some period of sickness leave — averaging 8.3 days each. Overall absence is running around ten percentage points above where it sat before the pandemic, and the trend is not reversing.[1]
Where this finding comes from:
Agency cover often costs twice what the teacher is paid.
The agency-supply bill in English schools now runs to roughly £1.4 billion a year. Department for Education data confirms mark-ups reaching 100% — schools paying over £300 a day for a teacher who takes home £110.[12, 113]
Where this finding comes from:
Disadvantaged pupils carry the largest share of the cost.
Peer-reviewed research across entire national school populations finds that rising teacher absence measurably depresses exam results. The steepest losses fall on pupils from disadvantaged backgrounds — those least equipped to make the gap up at home.[46]
Where this finding comes from:
Almost a third of teachers expect to leave within a year.
The Workload Reduction Taskforce names covering colleagues' lessons as one of the largest contributors to teacher attrition. A school that handles cover badly does not just lose lesson quality — it loses the teachers who keep being asked to absorb it.[6, 98]
Where this finding comes from:
A cover lesson holds together only when the teacher knows the school's policy.
Pupils lose up to 38 days of teaching a year to low-level classroom disruption. The Education Endowment Foundation finds the single most effective response is consistency — every adult in the room applying the behaviour policy the same way. That only happens when the cover teacher has been briefed on what the policy actually says.[33, 35]
Where this finding comes from:
A single safeguarding finding can determine the entire Ofsted judgement.
KCSIE 2025 requires a proportionate, risk-based safeguarding briefing for every temporary adult who sets foot in the school — supply teachers and cover staff included. An "ineffective safeguarding" finding automatically triggers an overall inadequate rating, no matter how strong the school is in every other area.[7, 165]
Where this finding comes from:
One of my biggest pet peeves was preparing a cover lesson and coming back to chaos, where I’ve had to repeat the lesson again. I wish this was available while I was teaching here.
The deployment of supply workers without adequate context is not an operational inconvenience. It is, in measurable terms, a determinant of pupil outcomes — and the effect falls hardest on the pupils least able to absorb it.
Cover My Class evidence review [46, 47, 101]Five functions. One workflow.
Cover My Class is not a timetabling tool, not a recruitment agency, not a learning-management system. It is the missing infrastructure for the cover moment itself.
A covering teacher’s morning — from “who am I covering?” to ready
First-year return on investment, Standard tier — conservatively modelled for a single 980-pupil secondary on a £30/month subscription. The licence is recovered roughly nineteen times over in year one, before any educational benefit to pupils is counted.
A business case built on theory, not intuition.
Every feature traces to a body of educational research. Six strands converge on one prediction: systematically transferring class-specific knowledge to the covering adult, before the lesson, should improve outcomes — most of all for disadvantaged pupils.
Shulman (1986) — Pedagogical Content Knowledge
Teaching is not the delivery of content; it is class-specific knowledge the cover adult cannot inherit by default.[79, 80]
Sweller (1988) — Cognitive Load Theory
Working memory holds ~4–7 chunks; a mis-calibrated cover lesson wastes them. The platform is, in CLT terms, an extraneous-load-reduction tool.[83, 84]
Bandura (1977) — Teacher Self-Efficacy
A covering adult's confidence is fragile in an unfamiliar room. Structural information substitutes for missing enactive mastery.[86, 87]
Hattie (2009) — Visible Learning
Variation in teacher quality is the largest in-school determinant of attainment — so cover quality is not a marginal issue.[71, 72]
Rosenshine (2012) — Principles of Instruction
Almost every evidence-based principle of instruction presupposes the teacher knows what the previous learning was.[85]
Ronfeldt et al. (2013) — Turnover Spillover
Adult instability harms the whole school as an organisation, not just one class — effects concentrated on disadvantaged pupils.[101]
Make the next cover lesson better than the last one.
A 60-day free trial spans a full half-term — the natural decision unit for school leaders. Annual prepayment receives a 15% discount.