As far as I know this isn’t entirely true, and the UK hasn’t had that much dialogue with Norway (6th biggest export destination).
At least so they have a blueprint on what damage to do.
Notably though, no many countries have been in a hurry to rollover either, because none of the countries believe the UK is dumb enough to go to ‘No deal’.
(But the SPS chapter of CPTPP may involve us from accepting things like Chlorinated chicken)