I really don't like the idea of a referendum, and I've told you why. It's a question of minority rights. On the other hand, if there are enough members on this committee who wish to see a referendum, they should certainly express that view.
I think that probably it should only be an advisory referendum, not of the kind that would change the law. I also think that, if this committee were to recommend any kind of referendum or any kind of referendum were accepted by the government, it should be a referendum, which, if lost in changing the electoral system, should result in the immediate reconvening of this or a similar committee to consider the question again.
I do not believe that proportional representation should be blockable by a majority of the country. They can vote against the government that brought it in if they object.