well lady miss jo jo, there is an excellent hi-fi shop in the tower bridge piazza just off shad thames. It is called Sound Hound, it looks scarey and expensive but the staff are lovely and helpful. I am sure that if they can`t repair it for you that they will know someone who will!
I would recommend against Sound Hound. They took over four weeks to get round to looking at my CD player, and then they didn't fix it. Try the authorised dealer for your brand. I did, and it only cost me £20.