This is ridiculous. I accept that there may be good reasons for Watch to skip series 6, but I see no good reason that they should refuse to explain why.
There are at least 3 mssage board threads asking why it was skipped, all calling for a Watch / UKTV official comment, and they have all been ignored.
I tried browsing the website for answers, and it's becoming apparent to me that they simply don't care. If you click on "Shows" followed by "Drama" the only link for Spooks says "Spooks series 3 and 4". It actually links to a synopsis of series 7. A synopsis that (a) tells you about the death of a major character (plot spoiler warning anyone?) and (b) includes a supposed synopsis of the end of series 6, which is actually an incorrect synopsis of the end of series 5!
Just in case it's worth anything I'd like to add my voice to the call for an explanation, PLEASE!