I haven't had my first child yet, though I am planning to have my baby in a midwife-led unit as long as there aren't complications between now and then and I know I can't have an epidural there. So I'm hoping to be someone who has a straight-forward birth and don't end up screaming for an epidural.
Anyway, I had my anesthetic review fairly early on with my 20week scan. The anaesthetist was surprised to see me there that early but it was just planned that way so I wouldn't have to go to the hospital twice.
She was understanding and talked me through the risks associated with a raised BMI and about how sometimes its difficult to site an epidural so if I want one then its best to ask for it sooner - as it'll be easier to place when I have longer between contractions.
I can't remember if she even asked what I was planning for the birth, it was more about her giving me the information (about increased risks, lowered effectiveness, if they can't get a local in earlier they may need to put a general in in an emergency etc) rather than her laughing at my plans to not have an epidural IYSWIM? She felt my back and looked in my mouth. Didn't seem to see anything that would prevent me from having pain relief if I wanted it.
I was ready to be sarcastic if I had been told off for my high BMI (well, thanks I'll bear that in mind when I'm planning the next one, but as I'm already pregnant and have been told not to lose weight...) but didn't need to be so defensive. Most folk have been understanding really, to my surprise.
The only irksome thing is she gave me a leaflet about obesity in pregnancy and why I needed the anesthetic review. It said:
^When will I see the anaesthetist?
If you are otherwise well and your BMI is between 35 and 40, then the anaesthetist will see you as early as possible when you are admitted in labour. If your BMI is greater than 40 you will be given the opportunity to meet an anaesthetist at one of your antenatal clinic visits. This will allow us to see you, examine you and discuss pain relief and anaesthetic choices in relaxed surroundings. This is easier than trying to explain things when you are having labour pains.^
I suppose it could mean that there is more discuss if your BMI is >40 maybe the risks are greater and the chances of them finding a problem when they examine you is greater. But I read it as... if your BMI is greater than 40 then you are clearly more likely to be hysterical and stupid during labour, so we need to have this conversation with you before you have a contraction and lose all reason. 
I may be a bit sensitive - mainly because my booking in BMI was 41 (just after christmas day and my wii had measured me that morning at just over 40). But at the time of the anaesthetic review my wii gave me a BMI of 38 (even if you assume that it was a little generous, it would still be closer to 39 than 40).
And the hospital gave out my notes to another patient that day
not sure I'd trust 'em with my baby tbh...
(prays for straight-forward birth in local MLU)