They were wasted. First Past the Post encourages parties to target voters in the marginals. You choose your side and if you don't win you don't have a voice. We will get better legislation if politicians work together across parties reflecting all voters views and reflect more accurately the diversity in the community. They target areas like education and health to generate public support.
Constant change causes disruption in public services.
In the single members seats. MPs will represent an area slightly larger than at present. As MPs will have the support of at least half their constituents, they will be more representative. The county or city tier MPs will represent a locality with which people identify. These MPs will be able to represent views for their area hitherto unrepresented at Westminster.