Geograph - photograph every grid square

The Open House Festival webpage for Preedy Glass Link describes it as "An industrial building originally built for maintaining railways with a modern rear extension now housing a modern glass processing company." The family company started in London W1 in 1913 supplying glass to the building trade. It moved to Park Royal in 1989 and concentrates on processing glass for domestic and commercial projects where special surfaces and edges are needed. The company's website Link includes history Link including supplying window glass for repairs after Zeppelin raids in the first world war.
For photos inside factory on open day see TQ1982 : Preedy Glass, hoist to move large glass sheets around factory TQ1982 : Preedy Glass, toughening process and TQ1982 : Preedy Glass, impact testing toughened glass.