Thanks to all the posts and pictures, I had a go this morning. Taking the bit of the dash off wasn't as hard as I thought it would be (putting it back even easier). Couldn't get a good grip on the loom plug to get it out but after a bit of wiggling have now got 1 and 3 setting working
Not perfect but better than before. So, I thinks it's the loom that's at fault and will get a new one in Jan 12. Thanks to all on this site, brilliant!