Regardless of your decision (or MEL applicability), once you have landed with the a/s u/s you then have significant performance penalties which could preclude departure from some airfields or the carriage of your payload. .It is always best to pullover and check the MEL and make a sensible decision as to go or taxi back. Having read the MEL for a/s u/s you will probably taxi back
. It happened to me in BA once and they were totally unprepared for the performance implications which I think required use of a flap setting for take-off that was not in the books we carried. I made the point to them (like JmQ, I suspect) that I considered the NNC inadequate.