A representative from each of the major political parties, plus a guest or two - political journos usually know a bit about what they're talking about, but it doesn't have to be one of those. Could be anybody else though.
An all LGBT+ Question Time next week perhaps? Perhaps an all ethnic minority one the week after?
Maybe a reasonable wide section of the community, of all sexes, genders, beliefs and races (as many as can be accommodated in one programme at a time anyway) after that? That would be nice.......