That 20 p was the cost of the cork sanding block that I bought today. I was thinking about whether I could use that block to carve a stamp.

The experiment ended in failure. It was not the carving that was the most serious problem, it was the uneven surface of that block that made the printing with ink impossible. I couldn’t even print a clear outline of Bon Bon.

But at least I made a start. I picked up my carving knives again after having neglected them for months.
A fab friend suggested I might try lino blocks. Well, that’s the next thing I’m going to investigate.
I’m not sure that was cork to be honest, it looks like some sort of polystyrene to me. Maybe you’d have a better result with proper cork.
I was not really looking for cork. That cork sanding block can be put at the back of my carved rubber stamps though.