The Liberal Democrat's ALTER
http://libdemsalter.org.uk/
Action for Land Value Taxation and Economic Reform working "towards getting the policy of Land Value Taxation accepted by the modern heirs of Liberalism."
A company limited by guarantee, registered in England (No. 00956714), Registered Office: 20-22 Wenlock Road, London, N1 7GU.
A charity registered in England & Wales (No. 259194) and in Scotland (No. SC044360).