Without question Zande would be your best source. You might also want to spend some time on her website. It has a lot of great information.
Not sure what the lockdown situation is in the UK, but when possible I think the best approach would be to arrange to visit the breeder. You get to know them. They get to know you. And they know you're serious.
In my experience Basenjis get along well with children if they know them, which is pretty much the same situation as with adults.