I can't speak for the London airports at all, never having used them, but Dublin is a pleasant airport and there are good train and bus connections into the city centre. I didn't get chance to do any sightseeing when I passed through on the way to Octocon, but I would like to go back some time.
I wouldn't totally rule out Manchester either if he wants to have a look at a typical British city that is not London. It also provides easy access to the Lake District and Peak District if he has a few days to kill.
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I wouldn't totally rule out Manchester either if he wants to have a look at a typical British city that is not London. It also provides easy access to the Lake District and Peak District if he has a few days to kill.