Icon John in house

This is the first of a weekly series of articles by architectJohnny Heriz-Smith about St Margaret's Chapel and Almshouses inGlastonbury.

OK, so an icon is a picture of a saint, and an iconographerwrites icons, because icons aren't painted, they're written.

This Saturday international Iconographer 'Icon John' is writingan Icon for David Cameron here in the end Almshouse. It's an OpenDay (see the listings page). Come and listen to him - his world is atreasure trove, and he's a good talker. Why is he doing this? Well,let me paint you a picture:

1,500 years ago a Welsh girl called Endelienta took up amissionary post in Cornwall, where she lived …