Sorry to be lazy, here's what I wrote on Marc's forum earlier:
What a great ending! I was so worried it would end on a cliffhanger but the writers managed to tie everything up brilliantly. I have to admit that it took me a long time to warm to ASHES TO ASHES, I always thought that it was quite inferior to LIFE ON MARS because it's very existence stretched credability to breaking point. That said, this last series has been excellent on the whole and I truly believe that last night's finale more than justified the show's place as a sequel to LIFE ON MARS.
I think we'll be waiting for a very long time before we see something on TV that's as clever and entertaining as this. I'm absolutely gutted it's over.