Not quite Kaa
Look at this!
It's a Grass Snake, but just a little one (see the nearby snail).
Turned it up during recent reptile survey work along with stacks of Slow Worms (see below).
This is such a beautiful creature - the yellow collar is the key identification clue. Although this is a baby, Grass Snakes can be really BIG - 1.8m+ !!
The larger darker adults are on the left and the paler juveniles on the right. Grown-ups in the kitchen drinking tea, kids all crowded round a DS or a PSP - the usual story.