You don't need to notify DEFRA, you do need to organise tags, goats do not need the eid that sheep have to have, but you can use tags with or without the chip, just look online for goat ear tags, it will show sheep as well.
Have you been given a herd number? That will be from APHA.
I presume you have a CPH nmbr?
If you are going to register the female, you will need the service certificate for the sire, if registered, and it will be the BBGS you notify
I only tag when they are leaving my property, they should be tagged before 6 months, but have such a reputation for tearing their ears, many keepers wait until they have to.
Where are the photos then ?