Channel 4 to launch HDTV service

Channel 4 is to be broadcast in high definition later this year, the first time a UK terrestrial broadcaster has simulcast its output in this way.

Viewers with a compatible TV and Sky HD box will be able to watch Channel 4 HD without paying an extra subscription.

However, only programmes recorded using high-definition techniques will be screened in HD, a format which promises better-quality pictures and sound.

Other shows will be seen in standard definition, a Channel 4 spokesman said.

He added that the proportion of programmes shown in HD would increase over time.

The BBC has offered a trial HD service since last year, but this free service carries a customised selection of programmes, rather than simulcasting an existing service.

Channel 4 said it "anticipated" that its HD service would launch in December.