ONE of the biggest differences between voting in the European, Scottish and UK elections, is the system used to choose MEPs in all but one of the UK’s constituencies.

It is called the d’Hondt method, and is a type of proportional representation (PR) named after Belgian mathematician Victor d’Hondt who devised it in the 1880s to improve Belgium’s parliamentary system.

His method has two formats – an open list, where voters select preferred candidates, and a closed list in which the parties are chosen.

EU elections use a closed list, so we vote for a party and not an individual candidate for Scotland’s six places in the European Parliament.

The first seat to be allocated goes to the top candidate of the party that wins most votes.

Then – and this is where it starts to sound complicated – the first party’s vote share is halved, and the party which now has the most votes gets the second seat.

This process repeats itself, with the share of the top party in each round being divided by one plus the number of MEPs they have had elected in the constituency so far in the process, until all the seats are allocated.

It is unlikely, therefore, that candidates at the bottom of a party list will be elected; but they may still become MEPs if an elected candidate later resigns and a replacement is needed.

This process is used by several EU member states to elect MEPs, and within the European Parliament itself to distribute chairs of the parliamentary committees and delegations.

It is also used to elect members of the London Assembly and as a national voting system around the world.