Yes, I would think SEN will be a very attractive diversion location for LCY, STN, LGW and even LHR - but limited by aircraft type of course, although no doubt the subsequent take-off will be empty of passengers so A320s and 757s can join the A319s and 737-500s. I'm surprised the Jersey 737 didn't divert to SEN. Presumably it needs to appear on the airline's "radar". as it were.