It's your right under the NICE guidelines to choose a CS. You don't need any special medical conditions....the drs will just need to make sure you understand the various risks with CS vs vaginal delivery (some risks are higher with CS, some are higher with vaginal delivery - my consultant said its pretty equal)
In my experience there was no resistance from the consultant at all. When I told the midwife I wanted a CS, she made me an appt with the consultant ( as is the procedure). I went expecting resistance, and Took a printout of the NICE rules, with the relevant parts highlighted. Almost literally he said 'you want a CS? Right ok. He explained the risks and then got the calendar out and offered me 2 dates.
In my experience, midwives will try to persuade you to go for Vaginal birth. I found a firm no thanks did the trick. If you can quote a few statistics from the NICE guidelines showing you've read them that also shuts them up pretty fast!
I was invited to a meeting with a senior midwife at the hospital. The aim was to ensure I really understood the pros and cons of my decision. I phoned her, said I understood the risks, had discussed them with the consultant and wouldn't be coming to see her (waste of my time, and I also told her i didn't appreciate getting the hard sell on vaginal birth from midwives). She wasn't thrilled, but wasn't rude or aggressive. She wrote me a quick letter just confirming we had discussed this and I was happy to go ahead, which was fine.
As for comments from friends/acquaintances, just smile sweetly and say you're too posh to push. This gives them nowhere to go with any snide comments.
The actual CS was a doodle. I was nervous but it was absolutely fine. Talking to many friends who had vaginal births almost all said it was horrific or at least pretty awful. I was going for tiny walks after 4 days and by 7 days walked up the road and back (500m?). Did 2 miles on the second week. However, I don't know how you would deal with a toddler (if you have one). Lifting them into highchairs etc would be pretty difficult in the early days.
It's your choice. My experience was extremely good. I would have one again in a flash.
Good luck!