It started a while ago in around January 2009
Fx channel
"We are pleased to confirm that Series 9 of NCIS is due to commence on Channel 5 at 21:00 on Wednesday 30th January" - channel 5 website KR
Usually the channel shows both
NCIS series 7 begins on the 22nd of September 2009
Frequent NCIS re-run marathons on channel 28, USA.
NCIS season 7 is being shown right now in the UK on sky tv's Channel FX, channel number 164, new episodes are shown on Fridays at 9pm. Repeats from all seasons are also shown on FX weekdays at 7pm and 8pm.
Season 7 of NCIS will be starting in America on 22nd September 2009 at 8pm on CBS == ==
In 2012
If you are asking about NCIS as an investigative agency, it is not in england but the europe &africa field office in naples italy covers the whole of europe If you are asking about the NCIS TV show, it is aired in England in FX, CBS Action, Five and Five USA TV channels
Go to Amazon.com and type NCIS, they have the whole series from season 1 to 6.
As of 2013, NCIS is the highest rated show on television and is continuing.
It already has lol