Shooting on '' Edge of Darkness '' began on 9 July 1984 and ran for five months until 5 December 1984 . Location filming took place in London ( including the Barbican Arts Centre , BBC Television Centre and the Hilton International Kensington ) , Yorkshire ( including the headquarters of the West Yorkshire Police in Bradford , the Middleton Railway , the headquarters of Systime Computers ( now the Arlington Business Centre ) in Leeds where Craven hacks into the MI5 computer and at Westwood Cottage , Ilkley ( for Craven 's home ) , Scotland ( including the Gleneagles Hotel , where Jedburgh addresses the NATO conference and also where President Reagan 's Reykjavík policy was formulated ) and Wales ( including Clogau Gold Mine and Manod , Blaenau Ffestiniog doubling as Northmoor with the hot cell a set constructed at a factory in Penygroes ) . Throughout the entire shoot , the production continued to be known as '' Magnox '' ; the title '' Dark Forces '' was briefly considered before the serial was renamed '' Edge of Darkness '' in April 1985 . As the shoot progressed it became apparent to the cast and crew that they had a potential hit on their hands ; Bob Peck recalled , “ I think we knew when we were making it that it was a good piece of work ” while Kennedy Martin told reporters “ I have n't had this feeling about something for 20 years . It 's wonderful , after all this time , to get something that actually works ”
Reykjavík policy
Reykjavík Summit
Edge of Darkness