Bournemouth Borough Council
Colchester Borough Council
Conwy County Borough Council
London Borough of Islington
North Lincolnshire Council
North Tyneside Metropolitan Borough Council
Horsham District Council
Fylde Borough Council
South Bucks District Council
South Cambridgeshire District Council
South Derbyshire Council
Exeter City Council
Falkirk District Council
West Dunbartonshire Council
Western Isles
West Lindsey District Council
Cookstown District Council
Copeland Borough Council
Corby Borough Council
Breckland District Council
Brent Council
Bridgend County Borough Council
Brighton And Hove City Council
East Dunbartonshire Council
East Hampshire District Council
East Hertfordshire Council
Oadby And Wigston Borough Council
Cotswold District Council
Ealing Council
South Staffordshire Water PLC
South Tyneside Metropolitan Borough Council
Spelthorne Borough Council
Sainsbury's Energy
Salford City Council
Swindon Borough Council
Tameside Metropolitan Borough Council
South Oxfordshire District Council
South Ribble Borough Council
South Somerset District Council
South Staffordshire District Council
New Forest District Council
Newham Council
Ashford Borough Council
Atlantic Energy
Bromley Council
Sefton Council
Sevenoaks District Council
Southend-on-Sea Borough Council
Portsmouth City Council
Powys County Council
Bedford Borough Council
Bristol Water
Good Energy
Gosport Borough Council
Kensington And Chelsea Council
Burnley Borough Council
E.ON Energy
Epping Forest District Council
Three Rivers District Council
Nottingham City Council
npower
Merthyr Tydfil County Borough Council
Merton Council
Mid Devon District Council
Midlothian Council
Wirral Borough Council
Woking Borough Council
Wokingham District Council
Arun District Council
Ashfield District Council
Runnymede Borough Council
Rushcliffe Borough Council
Rushmoor Borough Council
North Warwickshire Borough Council
Norwich City Council
Lewisham Council
Lincoln City Council
Magherafelt District Council
Maidstone Borough Council
Worcestershire County Council
Lewes District Council
Barking & Dagenham Council
Barnet Council
Barnsley Metropolitan Borough Council
Lancaster City Council
Wigan Metropolitan Borough Council
Teignbridge District Council
Telford And Wrekin Borough Council
Cherwell District Council
Herefordshire Council
Hertfordshire County Council
West Lothian Council
Westminster City Council
Wandsworth Council
Warrington Borough Council
Watford Borough Council
Waveney District Council
East Cambridge District Council
Walsall Metropolitan Borough Council
Waltham Forest Council
Gateshead Metropolitan Borough Council
Malvern Hills District Council
Manchester City Council
Calderdale Metropolitan Borough Council
Cambridge City Council
Bournemouth Water
Bracknell Forest Borough Council
Anglian Water
Angus Council
Somerset County Council
Southampton City Council
Ballymoney Borough Council
Newtownabbey Borough Council
Northampton Borough Council
North Ayrshire Council
North Devon District Council
Scottish Borders
Kettering Borough Council
Kings Lynn & West Norfolk Borough Council
St Helens Metropolitan Borough Council
London Borough of Sutton
Broxbourne Borough Council
Elmbridge Borough Council
East Northamptonshire Council
East Riding of Yorkshire Council
Devon County Council
Lincolnshire County Council
Basildon District Council
Basingstoke & Deane Borough Council
Newark & Sherwood District Council
Newcastle Under Lyme Borough Council
Hastings Borough Council
Havant Borough Council
Rochford District Council
Ipswich Borough Council
Isle of Anglesey County Council
Torbay Council
Torfaen County Borough Council
Torridge District Council
Shetland Isles Council
Shropshire Council
St Edmundsbury Borough Council
Dundee City Council
Clackmannanshire Council
Coventry City Council
Crawley Borough Council
Croydon Council
Pendle Borough Council
Perth and Kinross Council
Peterborough City Council
Renfrewshire Council
Wychavon District Council
Wycombe District Council
Wyre Borough Council
Cardiff County Council
Doncaster Metropolitan Borough Council
Reading Borough Council
Blackburn and Darwen Council
Blackpool Borough Council
Huntingdonshire District Council
Severn Trent Water
Sheffield City Council
Shepway District Council
Hart District Council
Chiltern District Council - Vale District Council
Chorley Borough Council
Orkney Islands Council
Oxford City Council
Gravesham Borough Council
Great Yarmouth Borough Council
Surrey Heath Borough Council
Hambleton District Council
Mansfield District Council
Medway Council
Melton Borough Council
Neath Port Talbot Council
Wessex Water
Daventry District Council
Harborough District Council
Harlow Council
Gloucester City Council
Suffolk Coastal District Council
Stockport Metropolitan Borough Council
Stockton On Tees Borough Council
Flintshire County Council
Aberdeen City Council
South Holland District Council
South Kesteven District Council
South Lakeland District Council
South Norfolk District Council
Mid Suffolk District Council
Milton Keynes Council
British Gas
Chelmsford Borough Council
Stafford Borough Council
Staffordshire Moorlands District Council
St Albans City And District Council
Canterbury City Council
Tandridge District Council
Icosa Water