Multiple political parties (Greens, Change UK) believe there is no need for Remain parties to coordinate because the election is held under proportional representation. This is wrong, and misunderstands the role of district magnitude
District magnitude = number of representatives elected per district/constituency. The magnitude of the regions used for EP elections ranges from 3 (NE England) to 10 (SE England)
The smaller the magnitude, the greater the "effective threshold", or vote share required to get elected in that district
A rough rule of thumb: the effective threshold is 75%/(m+1), where m is the district magnitude tcd.ie/Political_Scie…
For a ten-seat region, you probably need 75/(10+1)= 6.8% of the vote to get elected. For a three seat region, it's ~19%
You cannot (easily) move from these regional thresholds to national thresholds tcd.ie/Political_Scie… again 
But district magnitude (rather than methods of seat allocation like d'Hondt) are what create incentives for parties to coalesce
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