The thing to remember about about the European is not so much a matter of voting on domestic issues, but which block the Euro-Mps will be aligned with: the two main blocks tend be to Socialist (centre-left) and Christian democrat (centre-right), with the far left and far right factions.

From my understanding, their key role is to scrutinise the Council of Ministers - the leaders of the member nations who male policy.

So your decision when you vote should be which block within the EU most closely matches your viewpoint, and vote for the party that represents this.