I seriously considered it as it had always been my plan. I'm 24 weeks with my first and my first face to face appointment with a midwife won't be until 28 weeks.
In the end I decided against it as I felt a large part of the support, and the cost involved, would be to also have their support during labour and birth, which would have necessitated a home birth due to the current restrictions (at my trust anyway) of only having one birth partner and only during active labour in hospital, and I wasn't sure I wanted to decide on a home birth on that basis.
Instead I think I will focus on trying to find someone perhaps to provide breastfeeding support postnatally as my trust currently have a 6-hour discharge for all low-risk women after birth, and no home visits, so I think the extra support will be more helpful then.
I have found it an odd experience, I have never spoken to the same midwife and have actually only spoken to a midwife twice. My fertility history before falling pregnant was sad and complicated, but no-one seems to read the information I gave at my booking in appointment. I fell pregnant by surprise while taking HRT for early menopause and after saying I felt quite anxious about the pregnancy was referred to the mental health team, who have never contacted me. I wanted them to understand I didn't need specific mental health support, I just needed those involved in my care to know that my pregnancy has happened in very different circumstances from the majority of people and that my worries were heightened as a result.
I really felt I would need extra reassurance throughout, but unless you have specific medical worries, it might be more helpful to try and find support from friends and family, even if they don't have much experience, just people who are willing to listen and engage with your worries etc. That's what I've done, and hopefully it means I have a support system in place that will last well beyond the services of an independent midwife. I don't have family particularly nearby, but video chats and the odd socially distanced garden visit have been really great.