A friend phoned me to say Adam Price was heard on the news saying the stunt didn't help politics (or something similar) - of course Mr Price sort of ignored the large snail on Plaid's advertising board just a few feet away from our little debate in the sunshine about the pledge.
So it seems an invitation to sign a straightforward pledge, that there will be no coalition with the Tories, is somehow a threat to politics. However a large snail photo on a lorry is okay ! (you can look elsewhere for the advert!)
It is strange the things people say.