The only one i'm aware of in that length in made by a company called Wireworld. It is called the Starlight 5 HDMI cable and they do make lengths up to 10 metres. They are reputed to be the first high end HDMI cable on the market and as to be expected they are extremely expensive. You could try the link below to hificables.co.uk and give them a call to see if they can get a 10 metre one for you although they only have up to 5 metre ones listed and they are £400!!!.