"DH has been an arse about this"
Absolutely. I would lose a massive amount of respect for my DH if he treated me the way you're being treated by your partner. Shameful.
"I don't think its right for us as a family that DD gets put in a nursery/with a nanny, 4 days a week, from the age of 11 months"
Your DH obviously agrees with you. As long as he's not the one to have any negative effect on his lifestyle or career prospects.
"we should have talked about this more before DD arrived"
hindsight is a wonderful thing 
"am just focusing on what is right for our DD" "I can't be selfish about this"
Like your DH is?
"that means putting the needs of my DD first"
Like your DH isn't prepared to do?
... a word of warning, having read all your posts.
Please ensure that your NI contributions, pension, etc is topped up. I've seen husbands like your DH, with their arguments on this issue, with friends. It rarely turned out well in the long run, and every single one of them has ended up screwed financially in the end because it was "easier" to give in and stay at home, as both agreed one parent needed to be there for the little one. It says a lot about the respect your partner has for you when he argues over such issues, IMHO.