A little bit more on Life on Mars Series 2

The BBC's press release reveals not surprisingly that:

The second series marks the thrilling finale of the smash hit show and viewers will finally learn the truth about time travelling DI Sam Tyler (John Simm) and how he came to be stuck in 1973. However, fans will have to keep watching until the end of the series on BBC One before their speculative theories are laid to rest.

Executive producer, and joint MD of Kudos, Jane Featherstone, says: "Obviously, we will not be revealing in advance what eventually happens to Sam, as we wouldn't want to spoil everyone's enjoyment of the second half of his story when they watch series two.

"But they can certainly expect some shocking revelations along the way. We have even filmed two endings because we want to keep everyone guessing until the very end."

Synopses of the first four episodes are also available.