Can I / should I cancel a listing?

[mumdebump]

Got carried away listing items last weekend and included a couple of Boden summer dresses/tunics which I now wish I'd listed a little bit later in the year as I think there might be more interest then, when the weather's better, and so there might be higher bidding. I'd like to cancel the listings but one of the dresses already has a bid on it. Can I cancel it or should I let it run. Sadly need to make every penny count these days. WWYD?

And now for some reason I can't revise the listing to allow international bidding although another potential buyer in Ireland wants to bid.

you usually can't change them once bidding had started. I would cancel the others but let the one with bids run. My summer stuff will be hung up on the next free listing weekend.

Hung up? I meant Listed!