One of my most memorable jobs was building a window from three panels of stained glass from a 17th century church. The client bought them from a London shop that sells items from decommissioned churches. "It was just so amazing working on a piece of work someone else had worked on all those hundreds of years ago." As I worked I could see the glass float ripples and cog-marks in the lead made by craftsmen working more than 400 years ago and wondered what sort of tools they had used. "It was a real honour to work on this piece. I was terrified of having anything go wrong because it's just not replaceable."