We here at "Don't Be A Rodney, John Key" reckon that you should ask for a large select committee, rather than a small one.
Select Committees are groups of MPs who get together to work through particular issues. There are rules in place about the size of the SC and which parties the members are from. There are some tricks to this though...
As far as possible, the SC membership must be in proportion to the House, but this counts across all the various SCs, not in each one. So if we get a small committee (7 members), it will be possible to stack it in an uneven way, perhaps to keep another small party away from the table.
If we get a large committee (12 members), though, we get representation from every party. That will make sure that everyone has their say, in particular the Greens, who you can count on to say "stop wasting time on this nonsense, let's save the planet already!"
And that's why we want a large committee.