Well i have now watched both series of Life on Mars and all of the DVD extras.
What an absolutely fabulous show it is. It has a bit of everything - comedy, drama, fantasy and i don't think that it takes itself too seriously. A joy to behold and the best programme i've been introduced to in many a long year.
I particularly enjoyed the opening sequences of episode 5 of series 2 in which a little Sam Tyler figure emerged from a music box in Camberwick Green style. Then we were treated to a Gene Hunt figure giving a villain a kicking on a street corner. Hilarious stuff for people of a certain age

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I now have in my possession series 1 of Ashes to Ashes to view. On the box there is a quote from the Guardian stating that it is better than Life on Mars. It will have to be very good to live up to that boast.