> our vets asked us to leave and wouldnt start the c section til we had paid for it first, £700

Blimey! I have to be fair and say that, for me anyway, a C-section is usually at night, and I pay next time I go in. To pay up front is awful!
I have been asked to go into the operating theatre at night for one of my Collies (not a section) just to assist until she was anaesthetised (saved calling the vet nurse back out when she had just gone to bed.)
I couldn't stay and watch though - daft really when I've watched post mortems at work, but I wouldn't want to watch you cut one of my dogs open! However, I only stay in the nurses kitchen next door to theatre, and make myself a coffee if I have a bitch needing a section. Most of the vets will call me in afterwards so I can wait for my girl to come round, and watch pups with an oxygen mask! Very tiny pups, so all heads in the same mask!
I once had an emergency section with a vet that was fairly new, so didn't know me. He asked if I usually go home and wait for a phone call. I said no, I go upstairs with you and make a coffee while you operate. They must think I'm a cheeky so and so!