In British Gas Energy, we continue to invest in strengthening our operational foundations to drive innovation, retention and better customer outcomes in order to underpin long-term profit sustainability. The number of residential customers remained broadly flat over the year, as price competition remained low in the market and suppliers competed more on service and brand. The number of small business customer sites increased by 15% in the year. We saw lower complaints and a higher NPS, reflecting our conscious decision to invest in customer service.

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In British Gas Services & Solutions we have significantly improved our operations, as we look to stabilise our core activity of contract service and repair, whilst driving growth in on-demand and heating installs. Operational metrics continued to improve over the year, including a halving of job reschedule rates to 3%. This improved operational performance underpinned improved customer satisfaction, which was reflected in lower complaints and higher engineer NPS. Our improved operational performance and increased engineer capacity means we can now better target the significant opportunity that exists in the on-demand and heating installation markets.

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In Bord Gáis Energy we are focused on creating value from our integrated energy model, while investing in the future energy system to help underpin energy security and decarbonisation in Ireland. We continued to invest in customer service, resulting in lower complaints per customer compared with 2022 and and a 5pt improvement in NPS over the second half of the year, following a reduction in the first half. In line with our commitment to support our customers, we donated an incremental £3m to our energy support fund to help vulnerable customers struggling with bills, doubling the total to £6m over the past two years.

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In Centrica Business Solutions we continue to focus on strengthening our customer service foundations and delivering improved margins and sales performance in energy supply while also building a portfolio of flexible, green-focused assets. Having announced our new green-focused investment strategy in July 2023, we made incremental early stage progress in developing our asset pipeline over the second half of 2023. CBS net investment was £114m (2022: £19m) as we made progress on a range of solar, battery and gas-peaking investments.

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Centrica Energy had another strong year in 2023, against the backdrop of much lower market volatility than experienced in 2022. We continue to build out our portfolio of physical contractual positions, delivering a 3% increase in renewable assets under management in Renewable Energy Trading and Optimisation (RETO) to 13.0GW. Total renewable and flexible assets increased to 16.3GW (2022: 15.8GW). We also added to our global LNG portfolio. In July 2023 we signed a 15-year Sale and Purchase agreement with Delfin to take 1 million tonnes of LNG, free on board, from their floating facility in the Gulf of Mexico. Volumes are expected to commence towards the end of this decade.

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