We are in a high risk, 6-months testing area. We have 2 cows and their followers, none of our immediate neighbours ever have cattle in any adjoining fields, we eat all our own beasts (don't sell anything), and our vet has enacted a derogation for us to be tested only annually.
We would still need to comply with the on- and off- pre-movement testing requirements, and if we started having such movements would probably lose our derogation and have to revert to testing every 6 months.
You don't have to do a Tb test before sending to the abattoir. But in England you will now need a vet attestation, requiring a site visit to see the actual animals, and completing the documentation, within the previous 12 months, as you do for any species now.
Until recently, our butcher used to transport our cattle to the abattoir for us and charged a very reasonable amount for it. But he can't do that any longer, they are too busy. We have located a local hire firm who can hire us a trailer when we need one, but you still need quite a hefty vehicle to tow it safely. Our member who has the one vehicle on site which can tow the weight is leaving, so we will probably have to find an animal transporter (driver and vehicle/trailer), which will cost rather more.
The vet initially insisted on us having a crush for Tb testing. Thankfully a community-minded local beef farmer lends their portable crush out for small producers to use, and another community-minded local farmer totes it from farm to farm! But now the vets know us and our animals, they are happy that we do it in the parlour with the cattle haltered in the milking stalls.
Is it worth it? Not if there is any significant risk your cattle might actually get Tb, I'd say. Way too much heartache and the potential to end up with just money (which won't buy the equivalent meat) after all your hard work. So absolutely talk to your vet about your holding and ask them for their views, and their experience of Tb being diagnosed in your immediate area. (You should also be able to find out about diagnoses, when and where, online. Sorry, can't give you a link.)