The United Kingdom Association of Building Preservation Trusts (established 1989) acts as the representative body for Building Preservation Trusts in the U.K. Membership is open to charities whose principal objective is to preserve historic buildings. There are around 300 BPTs in the United Kingdom but not all are members of the association.
Legal status
The association is constituted as an unincorporated association and is a registered charity, number 1027919.
References
UK Association of Building Preservation Trusts Wikipedia(Text) CC BY-SA