Thanks to @edaross. I’d been hearing about this t-shirt doing the rounds at Spring Harvest, and been trying to find an image of it, and here it is… I still don’t have the real thing though, but can track it down to In Yer Faith (they haven’t quite got going with Twitter yet!).
P.S. I have quite a lot of photos of variations collected over past few weeks, should be up before too long!