Well, on ebay it's not way too much but straight from the shop... not a clue. You can just request a banner from someone if want, but it is good to have your own one as well bu I don't know the price in pounds anyway, and also don't really know, so sorry, I can't help you there.
xD Yes I can make you a banner soon, i'm good at GIMP but i'm new to photoshop... Uh, i'm not really sure how much it was, and it depends on what currency you use, so I can't say... I would if I could, but I can't. xD Are you new to forums?, just asking because you said that you were getting used to posting.