INIGO WREN
Building Surveyor, Chartered Builder and Heritage Consultant
London, Surrey, Sussex, Kent, Hampshire
Darron Carver MSc Building Conservation, MRPSA,  IHBC, MCIOB, MIOC, ACABE, Level 3 ABBE Damp, Mould and Condensation in Buildings
Full Member of The Residential Property Surveyors Association 

This is the second place i have found bits of broken glass used as galleting in Chichester, looking at the thickness of the glass I would...