Imperator, I don't want to repeat myself, so I'll reference my own post.
In Scotland, the SNP won 59 of the 73 constituencies. In a UK election that would be enough for an outright majority.
However in Scotland, we have list votes. The way this works, is that there are 8 regions, which each elect 7 more MSPs. Because of this, Labour gained an additional 18 seats, to their 3 constituencies; Tories gained an additional 21 seats, to their 7 constituences; Lib-Dems gained an extra seat; and Greens gained all 5 of their seats through regions. This is more representative, because without it, SNP would have an outright majority (I wouldn't complain, but it would be undemocratic); Labour, Conservatives, and Greens would be heavily underrepresented, and SNP and Lib-Dems would be heavily over-represented.
In UK elections, there are no "list" / "regional" votes. Because of this, parties are unfairly represented.
You can see the left map. Left map is constituencies. You can see the right map. Right map is regions, each electing 7 extra MSPs for proportional representation :)
Hope this makes sense now, because looking at the constituency map really paints a very untrue picture to what parliament actually looks like.