They do the operations a week apart normally, although if there are any complications they will not do the second eye
until they are happy with the first one.
from OE is excellent in my experience with them. Derrick Hannan and his team have been superb. An example of this was that for a couple of days after the first op, I was experiencing light flickering in my eye. I was concerned about this and contacted OE who assured me this was normal.