Indeed, you don't have to kill the snake, SAS Survival Skills seems to have a different survival doctrine to US SOCOM survival techniques. Punching the snakes lights out is the preferred British technique. The snake will become so disorientated that it won't be able to follow you to snuggle up in the sleeping bag later in the evening.

There are also significant differences in the consumption of ones own bodily waste products. Distillation of the Urine prior to consumption is the preferred SAS method to the Dual Survival demonstration.

http://www.youtube.com/watch?v=UCJFpwb2Opc

Peeling a rotten cow carcase to make a Cowboy hat, however does demonstrate some rather advanced millinery survival techniques beyond anything the SAS can muster though

http://www.youtube.com/watch?v=iNkvW1N0QNA