For SBF and Blues Brothers on the UK situation.
I think that the growth has been inflated by emigrants from EU. A CO told me that almost all of it has been JW from Poland moving in. The foreign field produced some newly baptised (mostly children, some relatives but proselytes as well). Now, many of them are moving back to their countries or other EU destinations because of Brexit and uncertain economics. I know couple of people waiting to be baptised. However, the young once do not want to take any responsibilities even if they are baptised. Many publishers are happy that they have more free time. It is more social group and it's hard to leave it. So, they decide to stay for friends and family, trying to do as little as possible.