<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by around the world:
Thanks for the informative replies everyone.
My travels would include flights to CDG, MIL, PRG, AMS, VNO, LAX, BOM, DXB, and HKG, all ex-LHR. Which airline would you recommend for each destination, if you could choose from any airline - not just oneworld or Star? Emirates to DXB? CSA Czech to PRG?
Anyway, back on topic. 
BA flies direct to all destinations. (I wasn't apply to view the schedules for LHR-VNO on oneworld.com for some reason.)
bmi flies direct to most of my stated destinations except PRG, VNO, BOM, DXB, where it seems LH and SAS are better choices, dependent upon destination. Flights to LAX if on a * alliance carrier would be on UA or Air New Zealand.
Are fares substantially lower on bmi than BA for Economy class travel? What about KLM?
GoldCircle: Thanks for your views on several different programmes.
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bmibaby has announced flights LGW-PRG, and I seem to recall that EasyJet may have as well. Don't ignore the low cost carriers to the European short-haul destinations--MIL, PRG, AMS and PAR. Many are even accessible from LGW on EasyJet/bmibaby, and even if you REALLY prefer LHR (IMHO LGW is underrated) the competition of course keeps the fares competitive, save for the LHR premium during peak business hours. Since the low cost carriers do not offer miles and you will probably pick a combination of whatever is least expensive/most convenient for each trip, I would encourage yout o focus more on the long-haul options when choosing your FFP. This is also where the benefits are most significant.