Archie Panjabi (Maya Roy) & Marc Warren (Tony Crane) also worked together on The Good Wife (2009) as Kalinda Sharma & Nick Saverese respectively.
My name is Sam Tyler. I had an accident, and I woke up in 1973. Am I mad, in a coma, or back in time? Whatever's happened, it's like I've landed on a different planet. Now, maybe if I can work out the reason, I can get home.
The bar scene: No beers cost 22p in 1973. Also, as the UK were still changing the money over, use and handing over of decimals would have been a lot slower than as shown in the film. Beer in Manchester would have been between 10np and 15np (or 2-3 shillings).
It was revealed in Ashes to Ashes that this era inhabited is a kind of police purgatory: Heavy artistic license can be used with these details, as it's not the real living world/ reality being portrayed.
The DVD sets of the series have much of the 1970s music replaced with public domain music due to rights issues.