Here are two written pieces by Simon. The reverse is blank and at first glance, I thought an image might have been loosely attached to the reverse and fallen off en route. But no, the writing IS the piece. Two of them.
Three additional cards arrived from Simon. Since they are quite similar, I've put the most readable on the top for you to see. His cards are always an interesting addition to any Mail Art call.
By the way TRNG is a small town in Hertfordshire, in England. I had to look it up.