rina i shouldnt think you'd need that cable.xml file unless you are using the original yadi image which came preloaded from germany? As far as im aware all the latest images from here are already setup with the correct cables.xml file for the UK...
Give the file above a go but i'm guessing that its either the same one that you've got on there already or an older version of it.
I also know that some tutorials such as 'DBOX for Dummies' contain irrelevant information such as "put a cables.xml file here, and a profile file here, etc" - the images on Digital World already have all these modifications done so it isnt necessary anymore to follow those steps, unless you are using a really old image (i.e earlier than mid-2004).