Sky1 will be showing episodes of 24 on Tuesday nights next year, alongside Prison Break. That means both Fox shows are being shown in the UK less than 24-hours after making their US début. The move is designed to curb illegal downloads, so hopefully it's a scheduling choice that will continue when other US series start, like Lost.
Incidentally, 24: Redemption is being shown in the US this Sunday, with Sky1 airing the 2-hour special on Monday @10 pm. My review will likely follow on Tuesday or Wednesday.