No interactions present.
Somehow, your capitals and smalls have become reversed! Natrix natrix is what I am sure you meant. :)
My Flickr photos...
to nearly 2 metres, so this is definitely a fairly young beast: it may be small enough to be one of this year's hatchlings. The books say anything from 10 - 20cm when hatched.
Lat/Lng: 50.99062, -0.48263
OS grid ref: TQ065223