Assuming a birth without long-term physical or psychological consequences, I think I'd be completely out of order to tell my husband that his desire to take an active role and experience solo primary parenting, in the period the only time the state makes available for him to do it, had to take a back seat to my desire for a longer leave.
If I told him to fuck off when it came to sharing the year's parental leave, I think it wouldn't be unreasonable to discover that he considered me the primary parent by my own choice, and more of the responsibility would therefore fall on my shoulders. People can't have it both ways.
Fortunately, we see parenting as a true partnership and take equal shares of childcare, children's sick days, flexible working arrangements and equal roles in all forms of parenting and household management. But go for it, MrsCaptainReynolds, feel sorry for me all you like. I've really got a rough deal here... 
Last time, I took 6 months and he took 4; we couldn't stretch to longer financially. (By the way, I continued to breastfeed until 17 months and we did BLW. It was fine.). This time we're in better financial shape but I still would never demand the full 12 months to myself - we've talked at length about it and I'll take 8 months, he'll take 4, and we're both happy with that. But if he weren't happy taking a smaller amount, it would be up to both of us to find a workable solution using the flexibility that's now available.
Some of the responses on this thread are an eye-opener. Surely OP wouldn't be deciding solo on what kind of weaning to try, or other post-4th trimester childrearing decisions?