I have a Pioneer 530H-S connected to a Sony VTX-D800U digibox. My aerial goes to the sony then the pioneer then the TV. I can't get More4 listed as a channel on the Pioneer GuidePlus. I get it listed and programme information for it on the Sony EPG. I am in London area, postcode SW6. This has happened on 2 530's, the first had a bad drive and had to be replaced. Any ideas?