50 million is too many people for the area of land called England

To be fair to WAV, this is a non-racist reason for opposing immigration. But anyone who was really worried about numbers would oppose immigration by anyone, including people who were originally born in England. Not only that, they would encourage permanent emigration by anyone, including people born in England; and, perhaps most importantly, they would discourage everyone from having more than one child, including people born in England. I don't think this is WAV's position.