Well, for a start, it would be significantly more expensive to cross there, it would be cheaper to have it further north and for companies to simply have headquarters and a route up there. This would increase economic trade and commerence in Scotland and Northern Ireland away from London, which is good for Britain. Also, by connecting Britain together, there can be an easy increase in Britishness, instead of looking at Northern Ireland as "over there" simply because you cannot drive there, and with a tunnel this is gone. Also, this would integrate Britain more. I always wondered why on packaging it goes "For Britain (except Northern Ireland)", this would get rid of things like that, and make Northern Ireland more British.
Also arguably, perhaps having two tunnels, one in the north and one from Wales might be a good thing.
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