^ Yes, I agree Caroline. But if you have to keep a paper book as well, what value does it add for you?
Not messing about with envelopes and stamps, and having (when it's all bedded in, and runs as well as the cattle one does) the security of knowing that the government systems have had and processed all your movements. Presumeably it will eventually be possible to have the mart do your 'on' movements too, as they can now for cattle.
I've used the English sheep one once, got the, "What's all that about, then?" and still had to do the forms for the abattoir, and have left it until we're forced to use it, by which time hopefully it'll be as widespread as it needs to be.
I still keep my own records for sheep and cattle, because there are inevitably things one wants to record that aren't captured by the government system. For cattle we use Farm Matters from Lines Mitchell, which is very functional, very useful. It does do sheep too, but I haven't investigated that yet. We mostly don't tag until animals leave the farm (apart from breeders we're retaining of course), so it's of limited use to us.