nings for a specific year and then determined the wage deflator coefficient for that year by dividing the average weekly earnings of that year by the average weekly inflation for 2023, as per below: Years 2015 2016 2017 2018 2019 2020 2021 2022 2023 Average weekly earning* 453 464 474 488 505 516 542 571 610 Wage inflation deflator 0.74 0.76 0.78 0.80 0.83 0.85 0.89 0.94 1.00 *Based on ONS average weekly earnings as of December 2023 Estimation of the monetary value of one hour of time saved for TFE users To estimate the average salary cost of school users, we analysed the survey responses to identify the roles of active users and their representation in the total number of responses. Using public salary sources as of 2023 for these roles, we estimated the average salary per role. We then calculated a weighted average salary by averaging the salaries across different roles, weighted by the proportion of survey respondents. Consequently, we determined an hourly salary per active user of £35.26. Role Average annual salary NI and pension contribution (33%) Total cost for council Average number of worked days in a year Average number of working hours per day Salary per hour % of survey respondents DSL or deputy DSL £33,500 £11,055 £44,555 231 7.7 £25 51% Head teacher £92,000 £30,360 £122,360 232 7.7 £68 16% Assistant head teacher £61,500 £20,295 £81,795 233 7.7 £46 18% Social Finance Limited +44 (0) 20 7770 6836 87 Vauxhall Walk, London SE11 5HJ socialfinance.org.uk 105 Pastoral and other £30,000 £9,900 £39,900 234 7.7 £22 15% The benefits of TFE only occurred in 2023, so no wage inflation adjustment was needed. 9d. Inflation and time value adjustment Time value adjustment to 2023 value Cost and benefits were adjusted to 2023 value using the Green Book social time preference