Orwell wrote:
Do you need cluster bombs?

Morally, I would say it's the right thing to do. I suppose you could debate whether or not it's the best idea from a practical standpoint. But really, Britain doesn't face any real threat from an external enemy, at least not one that could be dealt with as a conventional war, so cluster bombs don't have any real value to them anyways.
What about the morallity of asking your military to achieve a goal properly equipped so as to incur minimum casualties? In certain situations preventing them using a very effective weapon is going to cost lives. If your government conscripted you (not entirely out of the question) how would you feel about fighting a war with your military's hands tied behind its back? No landmines, and no cluster bombs, let's say. Of course, the US government have more sense than the British government in that regard, so the situation wouldn't occur, but your views on being placed in this hypothetical position would be of interest.
Just to correct your point on threats we face, as our government is usually in cahoots with your president, then we're liable to be facing the same ones as you. Indeed, our military is currently engaged alongside yours in several foreign countries where both have used the weapon in question. We may only be of limited use, but that's better than us not being there at all. We'd be even less use if we came minus a whole bunch of munitions some dumb new-labour females, and limp-wristed liberals thought morally dubious.
Oh, then there's the Falklands, whilst I'm mentioning areas we face threats. We had something of a spat there a while back with the Argies, you may recall. I expect they're even more keen to get their grubby little paws on the place with the price of oil as it is.