Example image of eyePlorer eyePlorer map for 'List of pre-nationalisation UK electric power companies': Electrical power industry Electricity Act 1947 (UK) United Kingdom Bedfordshire Buckinghamshire Derbyshire Leicestershire Lincolnshire Northamptonshire Nottinghamshire Staffordshire Warwickshire Ashbourne, Derbyshire Bolsover Borough Burton upon Trent Chesterfield County borough Coventry Derby Leicester Lincoln, Lincolnshire Long Eaton Loughborough Nottingham Retford Sleaford Spalding, Lincolnshire Urban district Uttoxeter Cambridgeshire Essex Hertfordshire Huntingdonshire Isle of Ely Middlesex Norfolk Oxfordshire Soke of Peterborough Suffolk 1893 Brentwood (borough) Clacton-on-Sea Colchester Colne Valley Dereham East Anglia Felixstowe Great Yarmouth Hitchin