The Brexit Party no longer have any MEPs
Well yes, that's obvious - she was an MEP at the time - 21st/22nd Jan.
I would point to this in response to your statement above and ask who exactly is the electoral system is tipped towards.
From the stats in your link I can't see the Labour Party opting for proportional representation either - the original post was about the Labour Party. PR does have disadvantages as well - it's not necessarily a better voting system than FPTP (PR gives extremist parties more representation, disconnects MPs from constituencies etc.) The Liberal Democrats were kingmakers in 2010 - they fluffed it. Far too many SNP MPs I see.
no deal is off the table.
Great - I don't know what you are all worrying about then.
when the duty limits change
The Guardian article gives an either/or;
"People returning from the EU would have the choice of continuing to purchase and bring home unlimited amounts of cigarettes and alcohol with duty paid–as is the case now–or to buy limited amounts at duty-free shops in EU countries instead" [in the event of a no deal].