sentences:  The companies affected were those privatized by the Telecommunications Act 1984, the Airports Act 1986, the Gas Act 1986, the Water Act 1989, the Electricity Act 1989 (and the Electricity (Northern Ireland) Order 1992) and the Railways Act 1993.The firms affected were BAA, British Energy, British Gas (now BG plc and Centrica), British Telecom, National Power, Northern Ireland Electricity, Powergen, Scottish Hydro, Scottish Power and Railtrack, the regional electricity companies and the privatized water and sewerage companies (including such companies now forming part of Hyder, United Utilities and Scottish Power).Since 1997, no further windfall taxes have been levied in the UK.