Does sound like a post-war scheme.  Prior to 1939 they were originally all-over silver which then gave way to an all over yellow scheme. 

However, the RAF operated surprisingly few Tiger Moths at this time with the Avro Tutor being the main ab initio service trainer. That’s not to say that there weren’t a good many Tiger Moths being used by RAF pupils.  The majority of these were civilian owned and operated examples at the ever expanding elementary flying training schools.  It’s these aircraft that, around 1939, would loose their rather colourful civilian schemes and don their more military looking coats of camouflage and yellow.