▁has ▁Bell ▁dedu ce ▁the ▁mental ▁state ▁of ▁Do yle ' s ▁father , ▁insp iring ▁much ▁the ▁same ▁reaction . ▁( This ▁scene ▁also ▁appears ▁in ▁the ▁otherwise ▁un related ▁drama ▁The ▁Str ange ▁Case ▁of ▁Arthur ▁Con an ▁Do yle , ▁also ▁by ▁David ▁Pir ie .) ▁▁ ▁David ▁Pir ie ▁also ▁wrote ▁three ▁nov els ▁related ▁to ▁the ▁series : ▁The ▁Pat ient ' s ▁E yes , ▁The ▁Night ▁C alls ▁and ▁The ▁Dark ▁Water . ▁ ▁Fil ming ▁The ▁series ▁was ▁fil med ▁in ▁Scotland ▁and ▁C rom er , ▁Nor folk . ▁ ▁Cast ing ▁Ian ▁Richard son ▁had ▁earlier ▁played ▁Sher lock ▁Hol mes ▁in ▁television ▁adapt ations ▁of ▁The ▁H ound ▁of ▁the ▁B ask erv illes ▁and ▁The ▁Sign ▁of ▁Four . ▁ ▁Epis odes ▁ ▁Pil ot ▁( 2 0 0 0 ) ▁The ▁pilot , ▁also ▁sometimes ▁referred ▁to ▁as ▁a ▁" Christ mas ▁Special ", ▁was ▁first ▁broadcast ▁in ▁two ▁parts ▁on ▁BBC ▁Two . ▁On ▁ 2 4 ▁March ▁ 2 0 0 3 ▁the ▁pilot ▁was ▁released ▁on ▁a ▁DVD ▁on ▁which ▁the ▁two ▁parts ▁were ▁edited ▁into ▁a ▁single ▁ 1 0 0 - min ute ▁film , ▁removing ▁more ▁than ▁ 2 0 ▁minutes ▁of ▁foot age ▁from ▁the ▁original ▁broadcast . ▁The ▁U . S . ▁release ▁of ▁the ▁DVD , ▁for ▁which ▁the ▁series ▁was ▁ret itled ▁Dr . ▁Bell ▁and ▁Mr . ▁Do yle , ▁followed ▁in ▁ 2 0 0 6 . ▁It