Thanks all ^
I think I'll go for the ET option (I could use the lounge if necessary but given the early flight time I doubt we'll want to be at the airport any earlier than absolutely necessary... and certainly won't want to drink any champers or anything...)
On the cashing-in-miles front, it's a pretty close call - 24,000 Miles accrued for £100 of Tesco vouchers, so saving £100 (after tax) on blowing 20,000 miles isn't really worth it. I'm probably going to lose the 2-4-1 but I suppose there's always the hope they'll extend it beyond the new 3-month max
PMI is a bit of a nightmare airport, but we're off to a friend's appartment in the north of the island so it's a short journey in the opposite direction from all the shell suited hordes.
cheers
Ewan