MumtoBlaire, when I talked to my consultant, she did put up a fight, but she has a reputation for being very anti elcs.
I got very shaky talking to her, and cried a bit, because I found it very upsetting talking about my worries about the consequences of any further damage, and also because she had informed me pretty bluntly that I would almost definitely need corrective surgery after the birth (which was quite a shock to me). However, I think getting upset sort of helped. I did have to really gather myself and take deep breaths to carry on though.
I had read up on the negatives of c-sections, so that I could be informed, and I didn't want her to think I was taking this decision lightly.
I also printed off something that LovetheSea linked to, a list of reasons for an elcs post 3rd/4th degree tear as recommended by the Royal College of Obstetrics. This was my talisman and made me feel like I was much more informed!
The main thing though, was that when she said to me, 'you won't tear this time.' I saw a bit of red mist, because of course she can't know that, and so I said, 'you can give me no guarantees, that I won't tear, I have had a 3rd degree and 2nd degree tear, both times with episiotomies - what if I have a 4th degree this time - mentally I don't think I can cope with the idea of that happening.' when I said this, she looked at her colleague (she had a jr doctor and a MW in with her) and said, 'I think you had better get the consent form'.
I really hope it goes well for you tomorrow, and you won't have to put up a fight, if you do, then just remember to take deep breathes, and if you have the slightest niggling thought, then say, 'I'm sorry but could we just clarify......'
Imagine us all stood behind you backing you up and supporting you. Good Luck.