* **1-party dominant,** 1 party has a chance of holding power
* **2 party,** 2 parties monopolise/compete at elections.
* **Westminister mode**l, in **post war era labour & tories dominated 91% of votes/98% seats in HOC**, system upheld by **FPTP**.
* **2.5 party,** 2 main parties challenged by growth of smaller party
* coalition 2017/2010- hung parliaments.
* **multi-party,** num of parties contend for gov- coalitions norm.
* devolved assemblies, use more proportional electoral systems, increases rep