An unexpected visitor

P usually goes out after dinner and looks around the pond. I think he communes with the newts and looks around for our single frog friend.  This evening, same as usual  (he's a creature of habit), there he is bending over the pond water and I hear a frightened cry of "snake". Now P does not like snakes, it might even be a phobia. I had go and rescue him from this monster.

It was really a snake, not just an earthworm  .  It was about 15" long and as thick as as a large pencil. It was swimming around the edge of the pond as if it was looking for a way out and wasnt happy being looked at by either of us. I wasn't sure what type of snake it was,  so I dashed  indoors to get a photo. Unfortunately,  I failed miserably but saw our baby snake disappear up under the waterfall base.  Investigation revealed it was a grass snake, not and adder thank goodness.  P is still not happy about it but I've calmed him down.  Liizard last month,  snakes this month,  what will it be next month, alligators?