The box arrived with Digi Repairs UK. last Monday and was back in the post from them, for next day delivery on Thursday, all fixed! Ive tested it and all is working fine now. There is 6 months warranty. You can speak to the boss for help and advice, his name is Martin, he is very good. The fault was said by him to be a component in the power supply to the tuners having burnt out. So theres the end of the story. But can recommend Didi-Repairs UK. fast, efficient service, fixed price and nice people to deal with, and they specialise in Humax repairs. Thanks to all for your suggestions.