All animals have to be bred in an establishment that has been licenced by the home office. There are very rare exceptions.
There are teams of animal care technicians, their sole role is to care for the animals, clean cages, feed water etc. I started out as one before a research group recognised my care and compassion and asked me to join their team to look after their mice.
I have been involved in some groundbreaking work and I'm so proud that I can actively see lives being helped as a result of lives being lost. It makes it a little bit easier knowing that someone is able to give their child a cuddle the way I can.
Avoiding repeating work that has been done elsewhere comes under Reduction. When the work is proposed they need to prove that the information can't be taken from a previous study. That also then gets double checked by the ethics committee.
Ever proposed study also needs to prove that enough in vitro work has been carried out to help ensure success of the animal work. Many applications get refused because the cost doesn't outweigh the benefit.
Blueplasticwig thank you for being interested in finding out more. I understand my title sounds harsh but I didn't quite know how else to word it. I'm glad you see that being spat on isn't productive. Luckily it's not so common now. Some more extreme animal activists also once send letters to the neighbours of a person involved in animal research accusing him of being a paedophile. We've all come a long way since those days and hopefully we'll continue. Unfortunately it may be a long time before we can stop using animals completely but it's the goal for us all.
Errol, as far as I'm aware the UK still has the highest animal welfare laws. In 2015 an EU directive was put in place to bring other countries in the EU up to our standard, I'm not sure what effect brexit will have on this. I'm not sure about legislation in other parts of the world but there are programs in place for sharing care and welfare information around the world.
Sorry if I've missed questions, I've been trying to type and breastfeed at the same time. Please just ask them again if I've not answered yours.