ITV HD will lauch on April 2nd
Hallmark Channel HD, which will launch on 28 June, will air shows including Law & Order: Special Victims Unit, Law & Order: Criminal Intent and Without A Trace.
Sky Sports HD 4 will launch on 29 April.
The addition of ITV1, along with the launch of further high definition services, Hallmark Channel HD and Sky Sports HD 4 will take the number of HD channels on the Sky platform to 40. With Sky News expected to launch its HD version in the next few weeks it is anticipated the total will reach 50 by the end of the year.