Conversations first need to be held about the reality of what leaving has actually done. Conversations then need to be held about what any ‘new’ relationship- closer than it currently is- with the European Union could entail. Until those conversations are held, there can be no conversation about rejoining. And all the time, the European Union is itself changing.
Currently, however, there is no appetite in either large party to begin that initial conversation, with both increasingly using Truss/Kwarteng as convenient scapegoats so as to avoid mentioning it. Even on the BBC, the ‘B’ issue is rarely raised outright by the interviewer; it tends either to be raised by a guest or asked on behalf of a viewer, so in this climate, conversations are unlikely.