This should make BD sit up a little bit. I've never found their service outstanding and their prices aren't really all that cheap either. GO seem to have found a gap in the low cost market with a bloody good-sized catchment area. Perhaps BA and co at BHX will feel some of the same as BD are about to too??
EMA could prove to be a very good move for GO if they get the marketing and the routes right.
EMA - BFS, EDI, GLA, CDG, AMS, BRU would appeal to the cost conscious businessman and the likes of BCN, PMI, DUB (a bit doubtful for GO now I suppose), AGP, ALC, FAO, NCE could all be a hit with the current BD leisure passengers if the prices and times are attractive.
Now that people are aware that the low cost carriers are here to stay (well a few of them are anyway), they will try them out with confidence and all it takes is for them to like it once and then they re-book for next time.
Go GO (but be careful).