Institute of Historic Building Consultants
www.ihbc.org.uk
Includes a forum for discussing building conservation
RICS
www.rics.org.uk
The Royal Institution of Chartered Surveyors
The Old House Store
www.oldhousestore.co.uk
Good site with information about sources of natural stone for roofing.
Stone Roofing Association
www.brookes.ac.uk/geology/stoneroof/
Good site with information about sources of natural stone for roofing.
Ty-Mawr Lime Co
www.lime.org.uk
Ty-Mawr Lime Co offers mail order lime mortars and plasters etc.
The Lime Centre
www.thelimecentre.co.uk
Useful site for obtaining lime products
Period Property UK
www.periodproperty.co.uk
Good site with information about sources of natural stone for roofing