Hi,
You need to register with your local animal health office for keeping cattle and register with BCMS (British Cattle Movement Service) in Cumbria. You will then be given a herd number, which you can use for sheep too. You will also get barcoded stickers from BCMS which you need to use when you do an ON or OFF movement. You can do the movements online or with the post cards which are in the cattle's passports.
Each beast has it's own passport with tag number, DOB, Dam on it and then the keepers address section, every time the animal moves the passport goes with it and it need signed, dated and stickered by the receiving keeper and also the previous keeper.
It's not too difficult once you know what to do. They always need to have 2 tags and if you're breeding from them you need to tag them within 7 days of birth and register them with BCMS so they can be issued a passport. Need to keep an up to date movement and medicine book as you do with all farm animals.
Hope that helps a wee bit,
Claire