Hi OP,
I've done part of my care privately. So sorry to hear you had such a bad experience with your previous birth.
I chose to take a maternity package with a private doctor in London, which included three or four scans with a Harley Street clinic, as well as the Harmony test, the regular NHS-style anomaly bloods, regular blood work and regular check ups through the pregnancy up to 34 weeks. I supplemented this with some Skype calls with my GP - for example they prescribed me omeprazole for acid reflux and iron tablets.
Then you have the option to transfer to private maternity care, or into the NHS. I transferred into the NHS at around 28 weeks as I was worried I was leaving it too long, but my private package continued. There was no issue with transferring - it was quite easy. I would like to pay for a private room for the birth, but it's 'first come first served' if you're not a fully private patient at the hospital I'm registered at, so there are no guarantees for that.
We also opted to have a doula, who won't be there for the birth because of Coronavirus, but who I know will be in a position to advise my partner if things come up, or if we need to make decisions. She's 'on call' in the lead up to our birth, and during it. In a non-C-19 time she would be at the birth.
We couldn't afford to do the whole thing privately - it's prohibitively expensive to give birth privately. However, I'm really happy with the choice I made to do some of the care privately. The scans and tests were fantastic. My reason for going privately is that I have OCD and find the Coronavirus threat really stressful. This way I felt able to go to smaller clinics with less people around, though I'm finding the last few weeks within the NHS particularly hard, especially with the news being what it is this week. I know other people are less worried than I am, but I felt that this way I could cope a bit better. I'm also a 'high risk' pregnancy purely because I'm 40.
Whether you go private or not, I would definitely not go back to that hospital that treated you like that. Best of luck with your pregnancy, whatever you choose - and I hope you get better care this time xx