There are some held in Official Publications under Department of Housing, Planning and Local Government. The most up to date versions of the regulations and the Technical Guidance documents are available on the Department of Housing, Planning and Local Government website (see link below). The building regulations and the Technical Guidance Documents are also available in the IHS database.
Environmental Impact Statement
The library has Environmental Impact Statements-1989-1999 on microfiche (ask at desk). An EIS may form part of an IPC licence application.