The more I watch the more similar I see the characters from these two series.
Spooks.Harry is similar to GITS.Aramaki
Spooks.Tom and Spooks.Adam are similar to GITS.Kusanagi
You have a hacker on both the shows. You have a brilliant gadget guy in both the series. Both the series are about internal security teams.
I am not saying that one is better than the other. They are definitely brilliant shows. I love them both. I recommend Spooks to anyone anytime. It is not the James Bond kind of movie where everything conveniently fits into a wrist watch. Above all – characters die and it is not always quite obvious when they’d die.