Investor Presentaiton

• Thames Tideway Tunnel • London's combined sewerage system operates at capacity London Tideway Improvements Abbey Mills River Lee Beckton Riverside Acton Crossness • • - 50-60 CSO discharges, 39 million tonnes of sewage discharged to tidal River Thames in a typical year London Tideway Improvements incorporates integrated Sewage Works Upgrades, the Lee Tunnel and Thames Tideway Tunnel Full length tunnel to maximise capture and conveyance to Beckton Thames Tideway Tunnel follows River Thames to control CSOs and minimise interference with existing infrastructure Three main tunnel drive sites ◉ Mogden Thames Tideway Tunnel EALING HAMMERSMITH AND FULHAM - 24 construction sites - 25km long - 7.2m diameter HOUNSLOW RICHMOND UPON THAMES - Between 35m and 65m deep 7 year construction Application of proven engineering with numerous comparable projects executed globally WANDSWORTH West London clay Greenwich Sewage Works Upgrades Lee Tunnel Thames Tideway Tunnel CITY OF LONDON CITY OF WESTMINSTER KENSINGTON AND CHELSEA Frogmore connection tunnel 16 17 11 Greenwich connection- tunnel LAMBETH Long Reach TOWER HAMLETS 21 22 The Limehouse Cut LEWISHAM SOUTHWARK Central London clay/Lambeth group/Thanets East Chalk Abbey Mills Pumping Station 3

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