Yes. How dare a regional accent make it to the BBC.
I'm not having that discussion again. The pronunciation of those words/numbers is wrong. Not debatable.
Th-fronting is a part of many regional accents. It isn't, therefore, "wrong". You just happen to dislike it.
Just because the use of th-fronting is becoming more common does not make it right. There is a widely recognised, longstanding correct pronunciation of these words. I have absolutely no objection to the use of regional accents - in fact, I welcome it. However, when an accent stretches things to a point where there's a significant deviation from the standard pronunciation of words, that's where I believe we have a problem. And 'th' becoming 'f' is one such example. I am aware of many accents which have many such deviations - and I can assure you, we'll never hear one of those accents announcing programmes on BBC One because the majority of the population would not understand half of what's being said.
There's a significant role for schools in all of this. I have read many reports of teachers being criticised for their regional accents. I am all for celebrating the rich diversity of accents. However, there are certain fundamental elements of pronunciation that need to be protected and standardised in our English lessons.
John and Alex Plain-Later gave kudos