Bast0n, Seasons Greetings!
Its a fine shot indeed and, with the effort involved, a somewhat remarkable achievement.
I've choreographed a number of aerial shoots (both stills and video .. without the benefit of gyrostabilisation) and know how challenging it can be to 'get it right' in a multiple aircraft set up.
Of Norway and Wessex .. I recall the late John 'Chalky' White retelling his tales of icing trials on the Wessex .. to the point where the main rotors began to lose effectiveness. It sounded most brave.
Wessex Memorabilia
This snippet of Wessex memorabilia records the 'International Helicopter Rescue Competition' which was held between 14-18 June 1971 and which was evidently won by "B" crew in a Wessex Mk 1 XP160. The card appears to be signed by 'Powell'.