The retrial of Sion Jenkins on charges of murdering his stepdaughter, ordered yesterday by the court of appeal, is just the kind of high-profile case the media would love to transmit on TV. Ever since a Los Angeles murder verdict in 1995 outrated the soap operas, executives here have dreamed of their own OJ moment. And this possibility came closer on the same day as the Jenkins verdict, with the revelation that the lord chancellor has authorised a pilot scheme for court TV…