Surname of baby???

Okay so I have a situation. I have been with my partner for almost 7 years. We have a 4 year old togther who has my surname because at the time we where goig through some problems and he didn't come to the register office to register her so She took my surname. She knows what her full name is and I think it would be confusing for her to change it to his and plus I have him so many chances when she was younger to change it but he was always busy doing something else. now we are is to have our 2nd daughter in 2-3 weeks time and I am saying she should also have my surname because it's not for her to have different to her sisters and plus I don't really want to have a different surname to my kids. I don't know why but I don't want them to have his family surname and me be the odd one out because I know this is stupid but it makes me feel like they have a claim on them then because of having same surname. He says change your surname to his then so we all the same and I said I would never do it unless through marriage (we are marriage in a religious muslim ceremony but registered it so it's not recognised and he doesn't think it's nessosary to do it). Here in the UK you can give your child any surname whether married or not and baby dad can go on birth certificate whether married or not as well. Just don't know what to do. I really don't want my baby's to have a different name to me. He is even going to the lengths of saying don't expect him to come to any doctor appts then with them if they still have your surname (at the doctors thier name comes up onto screen and room number to go see the doctor) because it's a show up to him. He currently isn't talking to me proper coz of it and at 35 weeks pregnant I don't have the energy to cope with this...
So what you ladies think what should I do give baby and our eldest child his surname or mine? 

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