It was on 1 February 1950 that Gene Markey’s Production for London Films of ‘The Wonder Kid’ was reported as being scheduled to go into Isleworth Studios on 6 February for four weeks studio work to complete the shooting following location work in the Tyrol and Vienna.

Newcomer Christa Winter arrived in England – but there were no other members of the Austrian cast needed.

The first week’s shooting was to be occupied with scenes showing Robert Shackleton, Christa Winter, Muriel Aked and Elwyn Brook-Jones.

Bob Krasker the lighting cameraman whose work on ‘The Third Man’ contributed so much to that film’s success has been assigned to camera work on ‘The Wonder Kid’

February 15th 1950

Karl Hartl directing the film moved into it’s second week – the first week having been taken up with shooting on a composite Salzburg Hotel set, comprising lounge, bedroom, and music room. Bob Krasker’s camera covered scenes between Elwyn Brook-Jones as Gorik, the Wonder Kid’s manager and his secretary played by June Elvin and also between Muriel Aked as Miss Frisbee, the Governess and Paul Hardtmuth as Professor Bindl the music master.

Another member of the cast was a large, amiable Alsation dog having taken over the role of Lowe, from the German police dog used on the Tyrol locations

It often can be a nightmare for any Studio Art Director to match up the location footage to the studio sets so this had to be done carefully and the task fell to Joseph Bato. An even more difficult task was taken on by George Gresty the scenic artist who was called on to provide a large painted backing seen through the window of the Hotel in Salzburg. He had one small photograph to guide him and yet produced a Tyrolean mountainside scene on his vast canvas.

Karl Hartl the Director – over a week – had been shooting scenes on three sets. Credit is due to the Studio staff carpenters, plasterers and painters all ensured that the sets were ready.

After these scenes, Hartl continued for two days on the exterior set of the mountain chalet reconstructed from photographs taken of the location for love scenes between Christa Winter and Robert Shackleton.

It seems the Studio shooting lasted little more than three weeks

BELOW is a portion of a comment left on the imdb site – I suspect I know who has written it :-

This now unjustly forgotten little film is thoroughly entertaining and wonderful to watch and definitely deserves to be restored properly and released on DVD. Apart from the truly picturesque scenery, Bobby Henrey’s performance as the cruelly exploited child prodigy who moves from misery to happiness is just wonderful. Highly recommended.

The Wonder Kid was actually released here in 1952. 

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The Wonder Kid – Pictured again with that lovely dog.