FPTP !
For that GE poll, I calculated seats too, parties indescending % order:
Seats Party % vote (% change)
306 The Brexit Party 26 (+2% change)
205 Labour 22 (-7%)
26 Conservative 17 (-5%)
33 Liberal Democrat 16 (+5%)
1 Green 11 (+8%)
56 SNP 4 (no change)
0 UKIP 1 (-1%)
5 Plaid Cymru 1 (+1%)
0 Change UK 1 (-2%)
Brexit short 20 of majority, so could - just - govern with c&s or a coalition with the Tories
As always, FPTP is cruel to the LDems & their geographical voter distibution
In a contest with 4-5 "major" parties, the Faragists could basically replace the Tories in the HoC
They can be the largest party or even win a majority, from about 24%, depending on how the other parties split.
At this level of Faragist support, the Tories would be decimated
- possibly the 2 parties would merge, but only if they let Farage be the leader
However, in this new multi-party situation, polls and seat predictions have a wider margin of error than usual
and also small swings in % to / from Faragists in particular, could cause big changes in seats