Sorry, CrosswordGeek, but "If it is because the Mother is finding it painful in the first few weeks, I'd see it as totally selfish and unnecessary." is very harsh.
Why add extra pain, infections, lack of sleep (through expressing and bottle feeding, or through going to formula and having to wash and sterilise endless bottles) to a new mother's life, when it's not necessary.
For the record, I breastfed, and my DC did not have a tongue tie. However, I have a friend whose DC was tongue-tied, and - although I, frankly, thought she was crazy to carry on trying so long - I was so sorry for her pain and repeated infections. Infections which lingered, of course, even beyond the move the bottles.
Please let's be humane to mothers here, as well!