The surprising issue of gluten in tea has raised its' head again. Spotted this blog by gfreebythesea about some potential cross-contamination in their green teas. They have posted warnings on the boxes. If you are used to picking up green tea (what could be safer that that!) do remember to check for changes every now and then.
It turns out that at some stage in the processing there has been some contamination. The original blog give a full response by Tetley - it doesn't help that their first member of staff talked about the bags being glued by gluten-containing glue. They aren't - just heat and pressure.