I understand your point llantwit about parental freedom 100%, but I don't don't understand why your so aginst your children being bilingual ( you say it's stated within this thread somewhere, so I'll have to re-read it)
I have to disagree with you on some points:
You say that you can understand Welsh history just as well in English, I don't think this is the case. They say history is written by the victor, so if you can only source information written in English, you're restricting yourself to a certain viewpoint. Granted, not everybody is that bothered about history. But the same applies to poetry and music, both of which played/plays a large part in Welsh history and culture.
You say you'r not happy with the amounts of money spent on Welsh medium education from your taxes. Well I pay for English medium education from my taxes. Some families (as you've pointed out) have to send their kids to Engish medium schools even though they want their children to a Welsh medium one. This is a situation where parental choice is severly restricted.
(I'm not holding you directly responsible for the lach of Welsh medium school by the way - yet

)
Also you have nothing against a bilingual Wales, yet you don't want your children speaking Welsh. How can a counrty be bilingual if half the population (or 75-80% can't/won't speak one of the languages). If some parents in Wales decided to go out of their way not to teach their children English, I bet they'd be prosecuted.
Anyway, I'm off to my cave now to wait for the airstrikes to stop