Normally you have your first scan at 12 weeks but as you have m/c in the past they may do one earlier or not, speak to your midwife when you see her and tell her you would feel better if you could have sooner. Good luck.
I am not in England either and it DRIVES ME CRAZY WHEN docs insist on doing scans before about 10 weeks. It seems that most women are in a panic with early scans because the sac and other important things were not seen correctly as it is simply too early. I had a scan at 10 weeks to check for viability ONLY because I have had 2 previous miscarriages..otherwise they will sometimes do one at about 12 weeks for dating and then 20 weeks and lastly at about 34 weeks.
Im not from England, But I do agree that they should see u as soon as you find out. Like here they wont see you until your 10 weeks... But I'd try maybe a different doctor if you can. Tell them your worried, and what happend last time. Cause you should be considered high risk