Revenue
Group underlying revenue growth was 7% with all four market segments contributing to underlying growth. The underlying growth rate reflects growth in electronic revenue of 7% with strong growth in face-to-face revenues offsetting the print decline. Risk continued to deliver strong growth, STM maintained its improved growth, Legal growth continued to improve and Exhibitions saw strong growth.
At group level, the impact on revenue of disposals more than offset that of acquisitions and the benefit of exhibition cycling effects, giving total revenue growth at constant currency of 6%. The impact of currency movements was to decrease revenue by 3%. Total revenue, including the effects of acquisitions, disposals, exhibition cycling and currency movements, was £9,434m (2023: £9,161m), up 3%.
Profit
Group underlying growth in adjusted operating profit was 10%, with growth in each of Risk, STM and Legal ahead of revenue growth, and the improvement in profitability in Exhibitions, well ahead of revenue growth, reflecting the lower cost structure.
Acquisitions and disposals combined decreased adjusted operating profit growth, giving growth at constant currency of 9%. Currency effects decreased adjusted operating profit by 3%.
Total adjusted operating profit, including the impact of acquisitions and disposals and currency effects, was £3,199m (2023: £3,030m), up 6%.
Operating costs on an underlying basis grew 6%, reflecting investment in global technology platforms, the launch of new products and services and the increased activity levels within Exhibitions, partly offset by the benefits of continued process innovation. Actions continue to be taken across the group to improve cost-efficiency. Total adjusted operating costs, including the impact of acquisitions, disposals and currency effects, were up 2%.
The overall adjusted operating margin was 33.9% (2023: 33.1%). On an underlying basis, including cycling effects, the margin improved by 0.8 percentage points, while portfolio changes improved margins by 0.1 percentage points and currency movements decreased margins by 0.1 percentage points. EBITDA margin also improved, by 0.8 percentage points, to 39.5%.
Reported operating profit was £2,861m (2023: £2,682m) up 7%, primarily reflecting the increase in adjusted operating profit and a lower amortisation charge in respect of acquired intangible assets.
Adjusted net interest expense was £296m (2023: £314m). In 2023, the adjusted interest expense included a charge of £26m in respect of the early redemption of bonds.
Adjusted profit before tax was £2,903m (2023: £2,716m), up 7%. Reported profit before tax was £2,557m (2023: £2,295m) up 11%, reflecting the improvement in reported operating profit, the lower interest expense, and the prior year including an impairment charge for some assets held for sale.
The amortisation charge in respect of acquired intangible assets, including the share of amortisation in joint ventures and associates, was £258m (2023: £280m).
Acquisition and disposal related costs were £69m (2023: £56m), slightly higher than the prior year due to restructuring costs incurred following the disposal of some of our assets.