▁was ▁played ▁by ▁three ▁actors ▁over ▁the ▁course ▁of ▁the ▁show : ▁Martin ▁W yl deck ▁for ▁two ▁episodes ▁in ▁ 1 9 7 2 , ▁N ig el ▁Stock ▁for ▁ 1 2 ▁episodes ▁in ▁ 1 9 7 7 , ▁and ▁last ly ▁Ron ald ▁H ines ▁for ▁the ▁rev ival ▁in ▁ 1 9 9 1 - 9 2 .) ▁Van ▁der ▁V alk ' s ▁French ▁wife ▁Ar lette ▁was ▁played ▁by ▁three ▁actress es ▁over ▁the ▁course ▁of ▁the ▁show ' s ▁twenty - year ▁run : ▁initially ▁by ▁Susan ▁Tra vers , ▁Jo anna ▁Dun ham ▁for ▁the ▁third ▁series , ▁and ▁finally ▁Meg ▁Dav ies ▁for ▁the ▁ 1 9 9 1 - 9 2 ▁rev ival . ▁Other ▁actors ▁in ▁the ▁series ▁included ▁Alan ▁H aines ▁who ▁played ▁Brig ▁M ert ens , ▁and ▁Richard ▁H uw ▁who ▁played ▁Van ▁Der ▁V alk ' s ▁son ▁W im , ▁also ▁a ▁police ▁detect ive , ▁in ▁the ▁rev ival . ▁ ▁Th eme ▁music ▁The ▁signature ▁t une , ▁E ye ▁Level , ▁composed ▁by ▁Jack ▁T rom bey ▁( a ▁pseud onym ▁of ▁Dutch ▁composer ▁Jan ▁Sto e ck art ) ▁and ▁performed ▁by ▁the ▁Simon ▁Park ▁Orchestra , ▁reached ▁number ▁one ▁in ▁the ▁UK ▁singles ▁charts ▁in ▁ 1 9 7 3 . ▁Also ▁that ▁year , ▁Matt ▁Mon ro ▁chart ed ▁with ▁a ▁vocal ▁version ▁titled ▁" And ▁You ▁Sm iled ". ▁In ▁the ▁final ▁TV ▁series , ▁the ▁theme ▁was ▁played