Similar sort of scenario ... I got one of those cheap CW tickets for 2 (can't remember which sale) LHR-EZE. I now see a very cheap F fare in this sale and would like to buy it for myself and let my colleague stay in CW .. I can't cancel my CW seat, I presume, as one of the two people on the PNR will still be travelling in CW (and it's non refundable anyway bar taxes). I'm not sure if I need to talk to BAEC before I make the new F booking ... should I