Without being funny, do you reckon it'll be worth it? Admittedly I've never flown from Exeter, but Southampton is my local airport and quite frankly it's poxy in terms of available services, couple of WH Smiths and the worlds smallest duty free. I still fly from there whenever I can though, as there's none of this turning up 2 hours before nonsense. 40 minutes before the flight is plenty, no check-in queues, wander straight through security, a quick wazz and walk onto the plane. Scarcely time to use a lounge, if there is even is one.
Of course, if you can blag the BA business lounge in T5 that's well worth it, but at a regional airport I'd rather have the extra time in bed..
Cheers,
Plug