cards of unknown pedigree

This set is a bit of a mystery to me. I have only been able to trace these meagre few copies of the set thanks to a Belgian submitter on Catawiki; I don't even know how large it is. Also, since the captions only mention the series name, this leads me to suppose that other Supermarionation series featured in this card collection as well. What intrigues me most though, is the subject matter of the pictures: some are behind the scenes shots, some seem to be specially posed for this series.
I changed the numerical order to emphasize certain similarities.

unknown manufacturer card 19
19
unknown manufacturer card 18
18
unknown manufacturer card 20
20
unknown manufacturer card 21
21
unknown manufacturer card 23
23
unknown manufacturer card 22
22
unknown manufacturer card 24
24
unknown manufacturer card 25
25
unknown manufacturer card 26
26
unknown manufacturer card 27
27
unknown manufacturer card 28
28
unknown manufacturer card 29
29
unknown manufacturer card 30
30
images sourced from the Catawiki website