My experiment
Checked dummy flights from NCL to DUB (on the pretence of a day meeting in DUB) with hand luggage only
Flight FR 17307:55
09:00Depart
ArriveNewcastle (NCL)
Dublin (DUB)OUTBOUND - FR173 07.55 - £4.00
INBOUND - FR172 06.25 - £4.00
With Electron - £8.00
With VISA Debit - £18.00
Hell of a deal!