That is most definitely not acceptable- especially with your history. You need to speak with a consultant not a midwife. Below are the links to the national guidelines which they are currently in breach of- read these and quote them at any medics until they take you seriously!
www.apec.org.uk/precog.htm
pesupport.friendhood.net/health-guidelines-nice-precog-f2/pre-eclampsia-community-obstetric-guidelin e-precog-t6.htm
PRECOG states that women who have had previous PE require specialist input BEFORE 20 WEEKS from an obstetric team.
Ideally this should be before 12 weeks so suitability for aspirin therapy can be considered.
Unfortunately midwives (both community and hospital ones) don't encounter enough people in your situation to be aware of the current research and treatment- and always assume that there's nothing to be done until PE symptoms appear- which is wrong!
It sounds like both your DCs suffered with some intra-uterine growth retardation (IUGR) and were quite small for their gestation- this agrees with PE starting some time before their delivery- which certainly makes you a good candidate for aspirin.
If you moved between their births you can request a copy of your medical notes (from both hospitals) by phoning the hospital and asking to be put through to medical records. They will charge you something for photocopying/admin fees but you can get them and then have them ready for any new doctors. Your current hospital should also be able to request your previous notes too and they should do this.
print out PRECOG, take it to your GP or the hospital- and don't leave until you have an appt/quick referral with the appropriate obstetrician.
If the appropriate specialists aren't available in your local hospital you should be referred to a larger hospital- this is what happened to me with DD.
There are a number of medical experts in the UK who specialise in PE and I really recommend you also ask to be referred to one asap. I ended up travelling a long way to see one but it was well worth it- they oversaw my care with DD even though it wasn't in the same hospital. APEC (Action on Pre-Eclampsia) have a list which isn't currently on the web but if you call their helpline they will be able to advise- the no is 020 8863 3271 but sadly it's only open mon-fri 9am-5pm. If the line's busy do leave a message as they will get back to you. They can also advise on how best to proceed if you're still having probs seeing an obstetrician urgently.
Good luck.