Not really seeing the significance of this comment, eitherway not sure why you waited so late, if another aircraft had started to transmit a long message what would you have done? Gone around?
Yes, go around would have been the only option.
Main point of bringing this out is that I was under the complete guidance of the controller, and it's very easy to forget something ON BOTH ENDS as simple
as a landing clearance. We both were doing something out of the norm AND the controller was handling other traffic at the same time.
I had just remembered at that point myself I had not been cleared to land (or for the option in this case).
So, I was hair trigger ready to go around.