"If you, though you are evil, know how to give good gifts to your children..."
I've just stumbled across this article on paedocommunion.
http://www.paedocommunion.com/articles/lusk_for_the_childrens_sake.php
So, to remind me where to find it in future, I've put a link to it here. Excellent.
(Given he mentions post-mill, presumably if I come back far enough into the future, I will see Bible-teaching churches across the UK that welcome children in this way).