Thank you guys...that makes sense. However, the confusion (for me) continues lol.
I started to register with ARAMS today, and they were asking for a flock/herd mark. I called the Animal Health people (i think) to register the flock, and they told me that they wouldn't give that to me, if my sheep were kept under the landowners holding number as apparently, it means they (as the land owners) would ultimately be responsible. Instead, they told me to register for a 'landless holders account'. I get the impression that this is a holding number for someone who doesn't own land, but might use different location???
I called the correct department and they are setting this up for me. However, I then need to work out how I move the sheep from the old holding number to my new one (even though I've not completed the process for the first move).
Does the flock number refer to the sheep I have at the moment, e.g. specific to the tags. Or, can the sheep change (as I buy and sell) within the same flock number.
Sorry for the 101 questions...just bit of a minefield for a complete newbie who has worked with, but never owned livestock before.